I think a lot of people are here for information (that is, after all, supposed to be the whole raison d'etre of The Rx in the first place.) Look at me -- I lurked for well over a year before I ever signed up, and until the RR and Politics fora were opened, I hardly ever posted, yet now am at nearly 4,000 posts in less than two and a half years. If the RR and Politics fora were closed I'd probably go back to my previous seldom-seen posting, which would in a sense qualify me as a lurker, a semi-lurker if you will.
An example of a semi-lurker (and one of my favourite Rx denizens) is Occam's Razor. This is a guy who hardly ever posts, except to put up his picks, and usually if it isn't pick-related he is offering either insight or a kind word to a fellow capper or someone in the Handicapping Zone forum. Not to be trite, but this is a guy who seems to really just have a lot of class, and while he is not a "volume poster" it is people like him that really contribute the most to the Rx at the end of the day.
Phaedrus