I get the sarcasm. And I also see the snare you've laid in the grass. "If they are so good, why not go pro?" The thing is, the revenue athletes (fka "student athletes") are the ones creating the revenue. Even if only a few hundred of them ARE good enough to play in the pros, they are still generating the revenue and not reaping the benefit, except for a bogus-value scholarship. The 100-odd FB/BB players at FBS schools are not only dragging along non-revenue athletes, they are also funding highly paid coaches and administrators.
You could ask the same rhetorical question about the coaches. If Mel Tucker is so good, why doesn't he go to the NFL? (what? and take a pay cut?) How about Nick Saban? (what? and fail miserably?) What about Fitz? (hahahahah!). You see, they are good enough to get gigantic contracts, but not good enough to coach in the NFL. Don't get me wrong, I value a good coach as much as the next guy. But it doesn't seem to matter if you have a good coach or a crap coach, they still make a ton of money, and the fans pay (tickets, streaming) to watch the players.
The only other high-revenue sport like this is horse racing.