The issue I see with so many catchers trying to get recruited is their focus on showing off great receiving, framing and blocking skills. Honestly, none of that matters to a college coach if you can't hit and throw at least as well as the rest of his starters. My advice to high school catchers would be to put hitting first and foremost in your recruiting efforts. Where do you fit as a college hitter? Don't go to a college's camp unless you can honestly see yourself making that team as the DH (assuming you're not just going for fun or the experience). Otherwise you're paying for the privilege of being a bullpen catcher for the weekend.
Of course, my advice is for guys that are dead set on starting. I know lots of college catchers who don't get to play much, but they're great teammates and love being a part of the team.