According to common knowledge if a house for sell does not sell easily there must be some reason behind it the most common one being over prising. People do not generally make offers on overpriced houses as because if substantially low price is offered than the asking price it is regarded as insulting to the seller and embarrassing for the buyer.
Although it is the seller's responsibility to decide upon the sales, remember to include even the overpriced houses in your list before buying a house. It often happens that a house, even in a hot seller's market, did not sell because of being overpriced and one can get a good negotiable deal after some time when the market is not that hot.
Now, not every home that is overpriced will ultimately sell for less than market value. But many homes that are listed at unrealistic prices are owned by sellers who are motivated and who are willing to listen to reasons why they should sell at a reduced price to you. If you find out that a seller has turned down multiple offers for less money, it might mean that it's just a matter of timing.