I understand - though it is very tribal and not in the spirit of the game to do such a thing - so like @burmecia said, there needs to be a cap on the lottery for each house, and/or MAYBE

Make a general pool for people who just want a house, that doesn't specify the location, but would almost guarantee a house SOMEWHERE (unspecified or very loosely specified so as to decrease trolling by friends) and have people enter THAT lottery and be unable to retract their bids - say...20 bids for 10 properties or something. Its still a choice and would still allow bidding on specific properties in separate lotteries.