And who determines what the level of usage is supposed to be? If they are entering the house once every 45 days they're meeting the standard for keeping it. I can understand how you feel however and I really don't quite get why people buy and then don't use them but some might simply have had only enough money for the house, aether and construction permit.

Personally I use my houses every day. I live in housing districts and it is where i spend most of my time when not in a duty.