There's no in-game system to sell your house. The closest thing is the 45 day reclaim, and that's been recent. When you bought your house you did so with the expectation of having no recourse to get that investment back. It is a sunk cost. Now you can even let it idle for 45 days and get 80% back. That's great. Do that.

I'd be for adding a "i want to demolish my house now" button for the 80%, since it's there already. Why force people trying to transfer servers to idle 45 days? Before that system was added, though, I would have said that wanting any money back for it at all is entitled.