There's an enormous performance tradeoff when the server has to stream every object in a house multi (which is what happens in a custom house) as opposed to loading it from the client that you already have downloaded (which is what happens in the pre-fab houses).
I don't think we are all an unreasonable mob in general. When this many people disagree with a decision, and are this vocal about it for years, then there's gotta be a problem in there. I don't know how to debate this as I have no idea of the logic behind the decision. But how long are you going to punish us for that? Limit the height of a custom castle to the height of the current one or whatever. You've said you don't think castles should have been put in the game. I'm not real thrilled by this but the players deserve this to be fair'. It's time to stick up for us the players and show us the support and respect we deserve. It in no way effects the balance of the game. Is it just possible your making a huge mistake here? I can't imagine any other situation where the actual people effected are so entirely upset with a system mechanic that it wouldn't be addressed. The customers don't see any aspect of the entire way this was handled as being fair. Considering the percentage of people that own castles in this game this is a real brouhaha.