I agree. This needs to change and they need to set a restriction of 1 house per server. However, I don't think it's right to take them away from those who have gotten them since technically this was allowed. I propose we grandfather those people and in the future, not allow more than 1 house.
If those players don't log in and lose their house to the demo-timer, they will not be allowed to purchase more than 1 house again. I also agree alts need access to the houses!