If you're a revenue and influence hungry church - which is all of them - then the most important mission is to gain and retain members. It's math, but not so simple as you think.
You cannot just assume that each member is giving, or even what percent each is giving. You cannot assume a one to one ratio between Membership and Supporter (financially) of the church.
Let's examine this further.
S = M x R x T
Wherein S is for the Total Financial Supporters of the church, M is the Total Membership, R is the Percent Actively Retained and T is the Percent of the Actively Retained who will become Tithers.
That would tell you - if you had the membership list, figures on how many stay the course, and how many tithe - the number of people who are actually supporting the church financially.
To derive the current Annual Revenue, you'd need another equation.
R = S x (.10 x I)
Wherein R is for the Annual Revenue, S is the total number of Supporters and I is for the average Income of each Tither.
That would tell you - if you had data on the Total Number of Supporters, and the average Income of that group - what you could reasonably expect in Annual Revenue.
For those unfamiliar with why translating these things into equations is important, it's because it allows you then to more readily see what might increase revenue. And what might not have as much effect.
As an example of what probably would not work, take "I", the "average income" of each tither. Sure, mathematically, raising the average income of each member of your church would result in more revenue with which to do good works or aggrandize leadership, or in most cases, both.
But any church's power to raise the personal incomes of their members is very scant. They can, and do, encourage thrift, savings, abstention from various - and costly - vices, and good work ethics. So a cynic might think that besides those things being good in themselves, that most all church's have an ulterior motive to promote those things.
That only succeeds broadly, though, and after you've already preached all those virtues, there's not much more you can do past that. The average income level of church groups is actually very stable in the United States, and various think tanks can - and do - tally up which faiths and/or denominations are the most and least well off.
It will come as no surprise that those with the greatest emphasis on those virtues are in fact among the wealthiest of faiths, when it comes to the individual Supporters. Judaism and Mormonism are prime examples. (And remember, I said "individual Supporters", not "individual Members", many who are on the membership list, but not Actively Retained, let alone being a Supporter.)
It might come as a surprise to some that other churches - quite a few, nowadays - have a wealthy base of individual Supporters, not by focusing on stern morality, clean living and hard work, but by becoming Social Do-Gooder Clubs, where those of the upper middle classes can have a pretense of piety at a very watered down church while soothing their consciences with all the "good works" being done by that church. The Methodists, Episcopalians and Presbyterians are prime examples of this.
If one were founding a new church, one might desire to focus on that which would raise "I", but for any of the established churches, "I" is already a given, by focus on the difficult virtues, or focus on charitable do-gooding, and not likely to go much up or down.
You might think then that focusing on "T" would be the trick. To encourage more to tithe. Yet most churches find this very difficult, because there is little extra for a member to gain - socially speaking - by tithing. If one attends at all, one is regarded as just as good as any other, and so whether you tithe or not, you're still going to have that good Christian status. Mormons have got around this by giving "temple recommends" to those who tithe, and that helps - a little.
To get around that problem in general, most non-Mormon churches set it up so that only tithers and/or other large and generous donors can be in leadership positions. Board positions, favored assignments, special titles and such. And that helps, to a certain degree, but there are only so many of such positions, and after those positions are filled, new comers, however generous, can at best vie for maybe knocking off the pedestal some current tither.
Mormons have done this, too, but with the other churches, that's all they have, they do not bar members who won't tithe from "The Lord's House".
As most have already guessed, the two surest ways of increasing Revenue would thus have to do with "M", as in increasing the total membership and/or "R", as in increasing the percent of those Actively Retained.
Actively Retained means that instead of they just having their names on the membership rolls, they actually come most every week. At the least. Past that, it is hoped that they are engaged with the other members, perhaps volunteering in some outreaches, taking some minor responsibilities (usher, printing bulletins, etc.) and coming to various church functions besides the worship service.
Now, the equations above show how to derive expected Annual Revenue of a church, but to figure out how to increase that, you'd have to know how to gain more Supporters, Supporters who will be tithing off of whatever income they have.
NS = C x R x T
Wherein NS is the total number of New Supporters in a year, C is the total number of those Converted to the faith/church that year, R is the percent Actively Retained and T is the percent who will become Tithers.
That would tell you how great an increase you could expect in New Supporters each year, if you had figures on how many were Converted in that year, how many Actively Retained and how many one could expect to become Tithers.
Persuading any body to give 10% of their income off the top is actually very hard for any church, for reasons mentioned before, but each church does try, nonetheless. Sermons/Messages mentioning "giving back" to the Lord and "sustaining the faith" and "supporting the church" are easily a monthly event, and a mention - in or out of the sermon/message itself - can be expected on this topic almost every week.
Yet given how little an effect that has - most Tithers are doing it or not, long before hearing from any guy up front - you can well see why churches focus so much on missionary efforts to recruit more members. And "fun" activities to engage those who are already members or just converted.
This theory, and it's basic math, can be tested. Looking about churches in America, there are few who have not took dramatic steps to try and increase and retain converts. And before any assume that this is not for financial reasons, but for simply following Christ's mandate to "Go ye, into all the world, and preach my gospel to every creature.", consider the manner in which the increase is typically achieved.
It is achieved by making it easier to join. Picture a leader of a Chess Club, he is enjoying the dues from ten of the brainiest kids in school. And if chess is the only goal, not revenue, he will be satisfied with that. What if you saw him try to water down chess, though? What if he proposed and rammed through changes like "You need not know how to play?" or "Checkers are substantially like Chess" or "We're really more about all forms of games"?
One might then suspect that revenue - not revelation - was the goal.
Observe America's churches. The stampede of the left leaning churches to the acceptance of fornication, divorce, homosexuality, "moderate" drinking and such. What is that but attempting to include those who previously would have stayed away, not wishing to hear how they had to change their habits and lifestyles?
Or the stampede of the more "Bible based" churches to having rock and roll bands, light shows, breakfast bars and everything light, fun and fluffy, as a background to the minister telling the crowd how bad all the left leaning churches are. While still accepting tattoos, long hair, sloppy clothes, premarital sex, divorce - oh, pretty much everything but out and out homosexuality. And even then, contorting themselves to "love the sinner (who has no intention of repenting) and hate the sin (which will continue on as, oh yeah, the sinner wasn't called to repent for fear of losing him)".
All of that is simply a drive for more members from a previously excluded base. And to retain members who have trouble "staying the course" on all the difficult counsel against sinning found in the Holy Scriptures.
Everything each church does, on the left and the right. And if it is not specifically on the issue of homosexuality or a lessening emphasis on vices, they will still try to make church as easy, as fun, as fluffy and entertaining as possible, not for drawing people to Christ, but for bumping up the only variables in the Mathematics of Money they can control - total number of new converts, and total number of actively retained members.
Now comes the Mormon church. Re-branding itself as "not Mormon" now so as to attract even more members. Making the hours less and lighter. Getting rid of pesky and time consuming non-fun activities like home teaching and Family Home Evening. Even taking the long overdue step of appointing two minorities to the Quorum of the Twelve, which was the right thing, but one suspects done for foreign membership enhancing - and thus revenue enhancing - reasons.
In all this - and more - they are but making it easier to join, easier to stay, and thus hoping to ramp up the only number they have some control over, in the hopes - probably justified - that it will then work out to more revenue.
Not more souls saved, by the way. One does not save souls by making Christ's message easier and shorter. One does not train the children of the Heavenly Father to become perfected by telling them it's okay to forsake monthly visits to those in need, or get around to an evening with your eternal family "as you can".
No, the only "inspiration" here is in the category of "how to bring in more money". No doubt so as to raise those "modest stipends" of $120,000 yearly to a living wage.