Billionaires move too. And while the housing market isn't great for sellers at any level , it can sometimes be especially difficult for expensive homes to sell. Buyers at high price points don't always love properties customized for the previous owner, and the additional cost of maintenance and upkeep can deter even the deepest pockets. Some people struggling to rid themselves of luxurious properties end up slashing their asking prices. Others forego selling them altogether, choosing to either