I'm not too sure, for most people, it is the biggest selling point. I wish I could find the post (it might be in TP... might be in Discussion.. not sure), but someone in the know once pointed out that most of the people who do buy TP never even (or rarely) post in the board.

Not discounting that there are people that buy it purely for the board though (I was one myself). I reckon it would still maintain its allure though, not as the only 'no rules' board, but as an exclusive, elitist 'no rules' board.