[alexiskai]

I asked an economist about this issue (we only see the asking price and not the selling price) and he had an interesting observation, which is that you could get a little more information by analyzing how long the listings stay up. The longer the listing is up, the greater the probable distance between the "market price" for the car and the listing price. Considered in aggregate, cars that sell quickly are likely to be priced close to (or even below) the market price.