NIL, except for a very few select individuals like Paige Bueckers is basically a negative ROI from a money standpoint. You'd have to convince these people to shell out millions of dollars a year and get zero return on their money besides wins.
The reason why these $EC schools, B1G, or some ACC schools can afford it is because they have massive alumni bases who are rabid about their sports teams, and they have multiple extremely wealthy alumni. Not like your average doctor type of wealth, we're talking hundreds of millions or billionaires.
We have neither of those.