The only way to stop this is to remove the reasons that make people want to do this. These botters and players who use clicker software are a symptom of the utterly broken housing system.

And no removing the placard timer isn't a fix because it would get replaced with other awful things instead, as we have seen before with cottages going for 50 million on some servers.

We need instanced housing to have a completely fair system in which the actions of one person cannot possibly affect another.