If you dominate in HS, know where you want to go play your college ball at and you already have a commitable offer there, a camp is nothing more than a free stuff convention. The rankings will change dramatically as these guys start their senior season so the off season camp based rankings are immaterial.
Camps are cool for some of these kids looking to get some more love on the recruiting trail, pick up some new offers here and there and, of course, get free stuff. But game film is really what rankings should be about. I mean, the camps are fairly similar to the NFL combine and we have all seen a bust or two in those.