It's a cycle. Fans will more happily pay the freight, indeed get on long waiting lists for the privilege to pay the freight, of a program that is a success and is demonstrably committed to continuing to be a success. Nobody gets on Dukes long basketball waiting list and pays huge mandatory donations just because they're gosh darn so prideful of their great Duke-ocity. Oh sure a few schoolphiles will be rahrah enough to not care, but 99% do it because Duke basketball is a proven winner and committed to stay a proven winner. Those people know their money, when or if needed, would get funneled to the best coaches, the best assistants, great facilities, and line the pockets of players more or similar to what Carolina or Kentucky does.
For a school with teams that have sucked for 40 years ... FORTY... understandably there will be less enthusiasm from customer base to throw money at such a hapless crew of bumblers. By experience, the assumption (a good one) is that the money would be squandered or channeled to something such fans wouldn't give a squat about.
It doesn't matter that the university brass and their sycophants don't like that, it's how it is.