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Have each comment start off at +1 and if it's gets upvoted above +1 then display it next to the comment. If it gets downvoted below +1 then keep the score hidden from everyone including the person who posted it. This way people will appreciate high voted comments but won't feel punished if their comment gets downvoted to oblivion (whether by trolls or normal people).
We can even take this further and have the User Rank be affected by the quality of your comments. A lot of high voted comments will increase your User Rank. A lot of bad comments could decrease your User Rank.
I've been a member since 2004 and my rank doesn't really mean anything to me because I feel just because a post is long it doesn't necessarily means it's high quality. Therefore I don't take the ranking system seriously at all.