What large camp is not a money grab. UNC, Syracuse and Duke have 250+ kids at their camps and they mostly scrimmage for 3 days. That equates to about $125,000 per camp. UNC holds at least 3 camps per year - it is all about $$. BC is a full day - 2 hour clinic followed by about 5-6 hours of 3v3 play. With only 150 kids there a very good player has a good chance of getting noticed. That being said, there is always a list of kids the coach is watching closely at every camp.
