I agree that our fans do less to pony up for the program compared to some of the other big boys out there.
Giving away 10% of one's annual earnings is also a legitimate roadblock for increased donations to things like BYU athletics.
That said, it's not the only roadblock. I think some people hesitate to donate because it isn't clear that BYU's governing bodies have any commitment towards actual excellence on the field of play. They have actively cut the athletic programs to church schools in the recent past.
If the governing body doesn't see excellence as a priority, and we have heaped additional obstacles on our own program and its ability to compete, there's an honest question of whether your thousand dollar, or $10,000 donation etc. will amount to a hill of beans.
If 100% of what the church does with its money was for humanitarian initiatives, covering the cost of operating churches, etc. there would be less argument. But this is not the case. Some of the expenditures in which the church has engaged makes funding it's flagship schools athletic programs a legitimate question.
Want more donor money? Sell the Fanbase a compelling vision of BYU as a competitive entity and convince us that you are actually serious. Win some big games.
This hasn't happened in a while.
Want less/no money? Keep writing checks to the U of U law school and delivering head-scratching policies and decisions while getting worked on the field of play.