I would think the developers of new homes could maximize their profits with open bidding for the homes, rather than fixed pricing. In some cases, the demand is so high that the buyers would have to go through a lottery. Is it done this way due to some regulations or because the developers want to streamline the sale process?
Oh don't worry we price them as high as they will sell, also in hot markets like in 2007 it was common to get multiple offers and to sell for over asking.
These days I'm just happy when I get a buyer.