People bid on their own crap. Using a secondary account, wifes account or have a mate bid on it to drive the price up.
It is usually a "pretend" bid that wins and the transaction doesn't happen. Either that or the winning bidder fails to go through with the sale because they are a dreamer, broke or the car turns out to be a bucket that doesn't match the description or similar.

If you want it, ask the seller what the selling price today is - or make an offer and see if you can come to terms.