GIven their restrictions on working, they pretty much have zero spending cash. I believe a small stipend is in order!
ETA: there are a few schools that pay with the blessing of the NCAA, so why not everyone?
If they need spending cash above what they already receive, they can always get student loans. The way I see it, they are getting paid 30k a year already so what would it hurt them to take out a loan and pay it back when they get a big contract or graduate with a degree after receiving a free education.