I had a side antique business for about 10 years. I have bought items at an auction then sold them again in the parking lot before I left the site. As far as prices goes, auctions can be crazy. I've seen stuff I was selling less than a mile away go for three times the price I was selling it for. I also have seen things goes for for pennies on the dollar. Just a matter of being in the right place at the right time.