Back when housing values were skyrocketing and mortgage brokers were increasingly becoming the go-to people for loans, appraisers were commonly pressured to lie about the value of the house. Why? To make sure that the buyer got the loan she wanted and that the sale went through, even if it was more than the house was actually worth. This is becoming less commonplace since banks have started cracking down on loans, but it still happens. You may think this isn't such a bad thing if you really want a certain house and the bank is telling you it costs too much. But what it means in the long run is that you overpaid, so you'll have a hard time selling it unless you or your buyer can come up with the extra cash at closing.