STEM research assistants often aid in the creation of patented objects and start ups that can yield the college millions. Meanwhile the STEM RA maybe gets a job at the startup as his only recompense.
Millions over years as opposed to millions every year.
And keep in mind that the STEM student is allowed to make money on the side while in college. Which the illusion of amateurism has prevented until very recently that of the athlete. No STEM student has lost their scholarship because somebody comped them a tattoo.