Having recruited at many camps in the past (including our own), the best thing I can compare it to is this: If you're working in a sales position and hoping to move up to management and have 1 outstanding month, it doesn't necessarily mean you will get promoted. However, if your resume shows consistent success and a few outstanding performances your chances will increase greatly. Now with baseball, having a good camp will get you seen by the coaches at those schools (make sure you go to camps at schools you are interested in applying to/attending), but if you don't have a resume to back it up the likelihood of receiving an offer strictly based on camp performance is minimal. On the other hand having a good camp without much history could put you on a programs recruiting list in the low 1st, 2nd, or 3rd tier of their recruits which is higher than you were before the camp. The tier 1 players are the ones that programs are trying to sign early with the National Letter of Intent (NLI) but a program will only end up signing so many players from that tier. Afterwards the will refer the their 2nd and 3rd tier recruits which you may have become after a good camp, because the tier 1 players that they didn't sign were likely signed by another school.
The short answer is: Attend the camps of the schools you are interested in, and be willing to be personable with the coach. College coaches are real people and enjoy good baseball conversation at the appropriate times. During a break, find the assistant coach or head coach, and ask him some questions and let him know of your interest. If they like what they see you will make their list somewhere. That conversation you had could bump you up a spot or two.
GOOD LUCK!!!