Most coaches are always interested because it is a business after all. Do your homework and understand where your son fits in the team if at all. There are a couple schools which over recruit and other schools which might be loaded at a certain position with returning players.
I've actually heard room & board are easier for schools to give away than tuition. Different rules at different schools, maybe.
But, very VERY few kids are getting full rides. Projected draft picks, maybe. Most of that is parents bragging. A buddy of mine's kid was a 1st round pick and is in the NHL, and when he was at an ISL school he was getting a couple of grand, based on how the formulas worked.