Potential buyers may try to make offers below market value because they know the owner is no longer living in the house. They will assume the owner wants to sell it sooner rather than later. Also, if there are any defects, like scratched floors or stained carpets, they will stand out more in an empty space than in a decorated one. In addition, not only are you likely to see a slower sales time with a vacant house, but you may see lower prices as well.