I worry about bio-security with anything I buy at auction, and I don't trust my self-control to only "just look".Always a good time. My advice: Go if you can!
As for selling, I worry that I might sell healthy birds to someone with a bad disease issue and get blamed for the diseases they already had. If I sell privately, I have a chance to "vet" the buyers (and I have dissuaded a few because I didn't feel like they would be good caretakers of "my chicks"). I probably worry too much about such things.