Cohabitors could also pressure each other with rewards, and with threatening to withhold rewards.
I'm not sure about the lack of residences. A storage locker isn't the same thing as having your stuff conveniently arranged for use.
Well, houses are at least a great deal more optional. I'm imagining them as something of a status symbol.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.