I lurk like a swamp monster. (I'm not sure why a swamp monster specifically, but I lurk like one. ) There's another forum I've been on for over 12 years, and I still have less than 800 posts.
I usually only post if I actually have something relevant to say, and most of the time I end up second-guessing it and scrapping the whole thing anyway, so that's why. If I posted every time I began to write a reply, I'd probably triple my post count--I've actually scrapped posts I spent nearly an hour working on. Either I can't get the wording right and worry that it'll be misunderstood, or I suddenly get bored of working on it and just dump the whole thing. (And sometimes, such as when I'm ranting about something, just writing about it is catharsis enough and I don't need to post it anymore.)