Here is an example of what I am referring to. Just picked a random university that I remembered from my coaching days...
It's the story all over America at small non-powerhouse NCAA and NJCAA tennis programs. The 4th ranked player from Peru, who isn't good enough to turn pro, can fit nicely onto an unknown USA school roster and hope to make a run at a national championship.
To be fair, there is plenty of room in American college tennis for players of all levels, ages and experience. But most foreign players coming to the USA are looking for scholarship money, good coaching and a good team to be a part of. A chance to improve and transfer up to bigger schools/better programs, and maybe even get good enough to win at the pro level some. They don't come to play for a hack coach on a team of high school players. Unless they are just looking for adventure in life...or in America.