I think this is a very valid question. It's just silly you can't!
I don't feel there is any imbalance if 2 people can acquire more than one, it's like saying "Why can an FC acquire more than 1 person!?", well the answer is so obvious it's silly.

In regards to divorces, there could be a system where both have to accept an agreement to split and destroy the house. That is more than fair.