GWP - if you run Excel, PM me an email address and I'll send you the files. If you don't run Excel, PM me a land address and I'll send you a hardcopy.
I think auctions are just as likely to over value an item as to under value it. People seem to live in deathly fear of missing out on a bargain; we have all seen guys walking into a gun show near hyperventilate on seeing someone walking out of the show with a gun on his shoulder and a canary-eatin' cat grin on his face. However, it seems that most auctions with guns will have a few people up on the price of every item and it only takes two bidders with "musn't miss a bargain" psychology to run the price up. It has been some time since I saw a gun sell significently under value at an auction. I'm always amazed at the "jack" a room full of good 'ole boys can come up with when guns are on the block. Among any group of GOB there is going to be at least one with significent means (count on it). I'd bet that at least two of the auction attendees knew exactly what they were bidding on.
