I caught this on last night and watched a few of em. The Dave guy is definitely an ass, Barry (Barry Weis is his full name

) is a bit suspect not to mention he shows up with a midget with nightvision and stilts, and the married couple the dude needs to grow some balls and not let his wife put em in her purse although she is definitely the smarter of the two.
The odd thing is, as some already said, that the other people in the crowd never bid. Also, it seems a bit odd that it's always the same auctioneer and assistant. My guess is the auctioneer works for A&E and the production crew for the show goes in to these facilities and buys all the defaulted lockers beforehand, then auctions them off with their own auctioneer. That would obviously allow them to go in and plant stuff in some lockers pre-auction to keep the show "exciting," but I'm sure a few of those are legitiment finds. They're ridiculously optimistic on their value of items though.
Haven't seen any of the other shows people mentioned other than American Pickers, which is interesting because of the people they meet and some of the odd stuff they find.