is selling housing bannable?

[Niwashi]

Just because someone is being honest doesn't mean you're going to get the house for only one fee. It can mean you're not going to get the house at all.

But if someone is giving up a house they no longer want (which was the scenario being discussed there), then the honest way to do that is simply to release the plot. If instead it's a house you want to keep, then the situation doesn't even come up.