I am sure he needs the cash
I'm sure he ha a nice scholarship covering his college fees, I'm sure he's not in too much financial trouble.
If he accepts money he's earning money from the sport and hence he plays tennis professionally, and then can't play college. It's like this in most if not all sports, golf is like it.
I'd like to know how much money he'd turn down before he'd say screw it, turn pro and take the cash. 2 rounds? 3 round? 4?