I echo this sentiment. I have been here longer and does not comment unless I have something of value to say, but do actively vote on stories or comments. People whom I know in real life and frequent here have the same usage pattern too. I would hazard a guess that there is a substantial amount of people in this category. So a purely karma based approach may not be sufficient.

About the same here. I'm a member for ~3.5 years and don't comment very often, not to say very seldom (my karma is at 23 points). When I write down my thoughts, I really want to add value to a thread, which I also feel isn't very often. Humble or shy - don't know.

I do frequently vote up good articles regarding programming, hacking, startups, and such things. That's the things I'm interested in since I was a young boy and that's my daily life. I'm a freelancing coder (yes, I see that term as positive, same way as hacking) since '96 and tried my own startups since then over and over. That said, I value good and constructive and sometimes also funny comments and being able to upvote them I frequently do so.

Are my upvotes even counted? I don't know, I don't really care. But I admit it gives a bit of a strange feeling to be "less worth" in a community where you participate - we can argue about that - daily.

Nevermind, just wanted to say.

Small addendum: After submitting this comment I remembered that I wanted to add that I'm from Europe and people not being from the States and therefore in a different timezone often experience to comment on already discussed topics (this also happens on Reddit a lot). Maybe this is also a part of why I'm not commenting that much.