Today, anyone are able to upvote a comment. But that didn't say anything about how much value the author of the idea has received from the comment.
I suggest an easy bar where the author could rate the value of the comment which also could generate "co-creation" points to the person who have commented.
Voting on Ideas
Vote for your favorite ideas by clicking on the up arrow.To undo an upvote, simply click the arrow again. This second click removes your vote.