re: Fournette's act of charity has forced the NCAA into a position it can't defend

In addition, they get acces to the coaching, training, and nutrition to maximize the chance to go pro.
Aside from LF, there are essentially no football players who can go straight from HS to the NFL. There are very few who can afford full-time coaching, a world-class workout facility, and the detailed coaching that will help them get there.
No one counts that as a value when looking at what the universities get vs the athletes, but it is huge.

It also is undeniable that, despite the fame of a LF, there would be someone that would be the top player in the NCAA this year and he would be selling jerseys. In other words, if LF had chosen another road in life and was never even a high school player, LSU would still be selling the crap out of some jersey worn by some other kid. The schools make the kids as much as the other way around.

Those things considered, and with the potential for abuse by boosters buying stuff from players for huge prices, means the NCAA cannot open the door for private auctions. Whether this does so, well, that's for them to decide