Stanford and Vanderbilt don't recruit from who shows up randomly at their camps - schools like that are out at the major tournaments, looking for the top players who are playing against other top players.
Several years ago I stopped by a camp a major conference program was running. Current players were helping with the camp. I knew one. I mentioned I only saw four legit prospects for the program. After I pointed them out the player said they were all personally invited after being seen at PG East Cobb.