Not just with owning more than one, but I feel that it will create a monopoly. I/e if you join early and buy a house for $200,000 (Hypothetical) and after a couple weeks, all houses are sold. Is there anything stopping the monopoly of someone selling their house for $2,000,000 or so? How will the houses stay worth the money you paid, and they are cheap, why would anyone ever sell them?