Some times the camp depends on the recruiting budget of the school or level. Using my sons school as an example, I know they find at least a couple of recruits from their camp each year. But they do not invite athletes they have already identified as recruits. When they were recruiting my son, they never mentioned their camp. We found out about it from a friend. My son asked him about it and they discouraged him from going. Their rational is they had already seen him and the camp was more about finding kids that they had not seen.
My sons school is a small D3 and this was another tool.