I think the answer must be that its contagious. I can't believe how often I post, never mind some others - but I for one am mightily impressed with the quality of the comments and the tongue in cheek nature of the humour of the forumites. They make it what it is, I guess its just a group of people who get to know each others personalities online, the more they get to know each other the more they have to say to each other. Its great to think that you can start a thread and people will say something, anything, about it rather than let it die, so people post with confidence.