Probably a lot of people like me. I read the forums everyday, but rarely post.
Mainly because of time, also there are certain people on here that come across as a little bit intimidating.
Besides I rarely have much to add to some of the topics as most of you seem way ahead of me in the curry making stakes, I've only ever made a couple of bases and still cant get a curry that tastes like a take-away, although my wife complains that the house smells like one the day after.
I think kicking out people who don't post all the time would be counter productive, lots of people read forums but don't post.