This is NOT a problem for housing. Your attitude is more toxic than those who leave their house empty. You have no right to tell people what they can or can't do with their house. If they abide by housing demolition rules then they get to keep their house, if they don't, they lose it, thats as simple as it should ever be. Some people use their house to craft in, some people use a house simply to have a summoning bell on hand. If someone has bought a house, they are entitled to do whatever they want with it, just because you weren't lucky enough doesn't mean that you have any more right to that plot than they do.