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.