To add on. Why 50? Random number to a point but I think thru a few (he went to 3) showcases, some of those colleges wrote him off their list, which paired it down to those that were interested in him. Of those that were, he got to investigate them and they him more closely until he and the college were a match.
I do think it would have been nice if he had only to go play ball and the coaches found him. But in our family case for my son we felt the best strategy to be seen by the coach that would really want him was to go to a few showcases where lots of coaches were.
His team choose tournaments where they felt the most RC would see the players. That was, also, a strategy of our family to pick a team that would do just that.
Lots of options on how to be seen. Up to each family / player how they go about that. PG, PBR and others provide one way. Lots of players are choosing that way