I too can back up what Robin and Matt (Beardedragon) have said. And to be perfectly honest, if there was like 1 or 2 vendor with bad animals I could see where you would be upset that we didn't say anything, but when it was honestly more than 1/2 that's another story. As visitors to the show it isn't our responsibility to make sure the vendors at that show bring animals with acceptable standards of health.
I understand your frustration, but in the case of the last couple of ATL Repticon shows, it should have been obvious. I think if anything you may want to consider the number of people who visit these shows and do not realize there is a problem with the health of these animals, because in the end those are the people who suffer the most.
That said, there are a few Vendors who are Top grade vendors, and honestly I hate to see them suffer because of someone else's mistakes.