@ACuriousMind I don't agree on that. It's always bothered me whether I'm right or not, but I usually do this:
always upvote when a post was useful for me personally. But sometimes that I want to just do my _civic duty_ , I look at the current vote count. If I feel it deserves its votes I do nothing, and if I feel the current votes don't really reflect the quality of the post, I vote.