Usually if you see a 10 that is uncommitted going into his senior year it is because of something other than his ability. Sometimes it is grades, sometimes he simply p[lans to go Pro. Justin Upton committed later than most in his class.
Regarding coaches, what if you asked them this question... Would you rather attend a tournament that had all 6 rated players or one that had all 8 to 10 rated players?
There is a reason they pay to show up at certain events and have to be paid to attend others.
College camps are great, but how could it possibly be as good as events and results from that event that reach nearly every decision maker in baseball. Or events that have 200 or more colleges and scouts from every MLB club. It's always best when many are interested.
So in the end, it is very simple... The more people that know about you and want you, the better it is. Even if the college you dream about wants you, it works better when other colleges want you.
Even though I am an advocate of college camps, please know this... Recruiting is done before college camp day in most every case. Colleges know who they want whether they attend their camp or not. And of course they try hard to get that player to their camp. But they don't turn down an impact player because he failed to attend their camp. I'd like to say that is my opinion, but it is simply a fact!
Of course, all scouts and recruiters want to see the kid play. Why wouldn't they? And if a kid is rated a 10 or ranked highly by us, they want to make sure they see him play.