I recently bid on a car at auction and you can choose a pre-bid amount. I was leaving the house and decided to pre-bid on a car, thinking the auction would take place after I left. As it turns out I was still at the house when the auction happened. It was very strange, they show the high bidder online as the bid amount changes. Every time the bid increased it posted my name until it hit the max and I was the high bidder.
To me it looked like they ran the price up to my max, I could have bought the car for way less, very fishy looking. I call Proxibid after and they said someone was bidding, but I personally doubt it, no way to prove it. I recommend you be very careful buying anything that involves these guys.
BE CAREFUL Buying anything represented by these guys!