I used at work for carmax in tampa and they usually appraised cars at a good price, usually the price is right around what kelly blue book says. But remember if you have any aftermarket mods its going to hurt the value. Sometimes the price is reduced because if they end up selling it retail and have to pay whatever it costs to repair or make it stock and if the modifications are too much they put it in wholesale and auction it so they can make a profit on it.