I've said it before in other threads, but it bears repeating.
College camps exist because of the difference between what the camps sell and what the parents think they're buying.
College camps sell high priced, short-term, group instruction.
Parents think they're buying exposure to recruiting decision makers.
Coaches are aware of this disconnect, so their marketing materials play up the number of camp alumni who made their rosters. But numbers can mislead because a lot of players who are already being recruited attend a camp anyway. The number of "cinderella kid" campers who show up unknown and steal the show is vanishingly small. For every story of a player whose camp experience led to an offer or roster spot, there are dozens of campers who leave unhappy because they feel they weren't watched closely enough by the recruiters.
No college coach whose job security depends on finding talent will make camps a significant part of his recruiting strategy because the odds are prohibitively against enough talent randomly showing up from their email and direct mail advertising. Coaches will continue to do the majority of their recruiting at events where talent shows up in concentrations that make it worth their effort to attend.