Two thing to remember. Camps are used to generate MONEY, not recruits --- AND --- coaches are ALWAYS looking for talent so if a talented player shows up at the camp you can rest assured they will notice. Makes no difference WHERE they see talent (game, camp, showcase, or a sandlot) they will be attracted to it and the player's talent starts the recruiting cycle. Coaches want parents (like yourself) to THINK their camps are an important part of their recruiting machine but they aren't. Camps are not the most cost effective way to gain exposure UNLESS you're targeting that particular school. Al MA 08 best describes this:
I am a firm believer that you need to pursue the school(s) you want to play for (one that you have the ability to play for and is the right fit) as much as you want the coaches to pursue your son. Pursue your top choices for schools/baseball with a passion and the coaches will notice. The coaches will notice this and sometimes this will make a difference in their choice. I would NOT go to a camp based on an invite. I would however go to a camp if that college appears to be a good fit and is a college your son wants to target.
My son played for Auburn University. He had attend just two college camps while in high school -- University of Alabama and Mississippi State. Mississippi State continued to send my son invites to their camps up until his junior year at Auburn ---he had already played 6 games AGAINST MSU. Ron Polk (then head coach at MSU) had even sent my son a congratulatory letter when he signed at Auburn. Just a name on a mailing list!