Assuming that the primary purpose of badges is to encourage contribution rather than discourage, perhaps we should have a Sidekick badge for those who have high-voted comments on, say, 50 or more accepted answers (or possibly, to widen the criteria, answers with 10 votes or more). Due to the narrow criteria, I would expect this to be a Gold or Silver badge, or perhaps, have different levels as in Nice Sidekick, Good Sidekick and Great Sidekick as corollaries to the Answer and Question badges.
I feel this badge would encourage users to contribute to the good answers.
Obviously, the name can change (to protect the innocent).