If you consider there are roughly only 3-5 players (out of, let’s say 40-50 per year) on each minor league affiliate that will even make the majors (some just “cups of tea”) the cost benefit analysis isn’t going to work.
Not to mention so many modern players (including most first rounders/high picks) are pushed by agents and trainers to eat a healthier diet and have off-season fitness regimens...and lots already started to do so at university, just maybe not quite so well as the premiere D-1 football and basketball athletes, but even that gap has closed a bit.