Theory: People use this site as a geek / intellectual social outlet and/or insight porn and/or self-help site more than they seriously try to get progressively better at rationality.

Is that actually nonobvious? It's sure as hell what I'm here for. I mean, I do actually generally want to be more rational about stuff, but I can't get that by reading a website. Inculcating better habits and reflexes requires long hours spent on practicing better habits and reflexes so I can move the stuff System 2 damn well knows already down into System 1.