zlacker

I think this is indeed a low hanging fruit. Upvoting should have some negative side effect or limit that makes you think for a split second if you really want to do it.

In articles: personally I only upvote only those articles that I really want to see in my "saved stories".

So one might make voting comments clutter something for the voter and I think that most hackers like to keep things beautiful, clean and searchable if possible. Might work better for articles than comments though.