It seems like it is worth nothing but a badge, as documented here: http://meta.stackexchange.com/questions/17364/how-does-comment-voting-and-flagging-work http:

It seems like it is worth nothing but a badge, as documented here: http://meta.stackexchange.com/questions/17364/how-does-comment-voting-and-flagging-work http://meta.stackexchange.com/questions/17364/how-does-comme... "No reputation of any kind is earned or lost from comment votes, though the Commentator badge is awarded for leaving 10 comments, and the Pundit badge is awarded to those who left 10 comments, each with a score of 5 or more."