The Church has plenty of cash, a lot of it from non-tithing ventures. It isn't a matter of having the money or the sanctity of the money. Tithing isn't used to pay coaches anyways. It's a matter of whether they want to spend it on coaching.
The Church has a history of paying employees across all disciplines (BYU professors, Church accountants, lawyers, etc.) below what they are worth. They will tell you salaries are at "competitive rates," which is code for "we looked at the national average and are paying you on the low end of the average but still within the average...did we mention we're a non-profit." Meanwhile, they will expect results and effort typical of tier 1 institutions and businesses.
And, they can. There are plenty of people that consider it an honor to work for the Church. And, there are plenty of professionals that want to live in Utah that will accept "competitive rates."
When it comes to football though, the model doesn't work. You get what you pay for to a degree. If BYU is serious about football as a missionary tool then the bigger stage it plays on the bigger the influence. I suspect that notion isn't lost on the BoT, they just don't want to pay for it yet. So, we're destined to be a stepping stone, not a stopping point for talented coaches. Should we ever make the playoffs, I guarantee you we will be shopping for a new coach shortly thereafter.
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