Lefthookdad's response reminds me of a story:
Sometime in the Fall of my son's junior year, he attended a "prospect" camp at an ACC school (In this instance, not the one he ultimately attended.). During one of the camp's breaks, the school's lead recruiter came over to me to say "hello."
When asked how he rated the talent level of the 40-or-so players present, he replied that there were 3 or 4 who were capable of contributing regularly to an ACC roster.
In support of lefthookdad's response, the point I'd take from this camp experience would be that if you were a parent of one of the "3 or 4," you probably came away from it felling pretty good about it. At the other end of the spectrum, some parents of the remaining 36 or 37 probably left dissatisfied that their sons didn't get enough attention and/or praise. Meanwhile, those whose sons attended with other goals in mind (skills improvement, camp experience, etc.) probably went away with a varying array of assessments.
Seems to me that one's objectives for the camp experience and self-assessment of skills level would threaten to skew the results pretty significantly.