So what is to stop someone who owns a cable TV chanel and a few stadiums in large cities setting up there own league and paying the players. The players could then pay their own college fees and the person who owned the cable company would get more money because they would not have to pay for other stuff at the schools.
http://en.wikipedia.org/wiki/World_Series_Cricket
There are alternative leagues in American football. But they have not been very successful. Generally their athletes are those who can't make it in, or to, the NFL. Football is an expensive sport. And has not attracted a big fan base for the alternate leagues. So is not a good business opportunity for the most part.