I as well. I've been 'lurking' on hacker news for almost two years. It doesn't mean I don't want to participate, it's just that whenever I do have something to say it's typically been addressed already by another user (the topics I'd probably post on are the hot-topics that draw more eyes.) And I'd rather not add redundancy to comments. To me the natural game mechanics that arise from 'gunning for karma' by being first to post (relevantly) takes a lot of effort.