I've recently seen a few up-votes on my comments on some answers/posts/questions. However, I've noticed that I never received any reputation from them.
Why is it that we don't receive reputation from up-votes on comments? Or do you get reputation when 10, or 20, people vote up a comment?
Comments serve an auxiliary function; they exist to support the all-important questions and answers. The goal is not to generate more comments, but better Q&A.
As such, you should assume that comments will be temporary; if you're putting information into a comment that would be nice to have around long-term, consider trying to work it into the question or an answer instead.
Granting reputation for comment votes would create a perverse incentive to post more of them and keep them around longer, potentially resulting in situations where questions and answers are buried under scores of kibitzing comments - the sorry state so many forums find themselves in.
Also, we'd probably have to implement downvotes.
