Suggest HN: subcomments Karma

I hope this wasn't suggested before: Instead of just ordering comments by Karma, I would suggest counting the Karma of the subcomments as well, however at a certain discount rate, depending on the how many parents that comment has. eg: comment Karma ¦- 0.8 * subcomment ¦-- 0.4 * subsubcomment ¦--- 0.1 * subsubsubcomment I think this would help bringing interesting but controversial discussions, sparked by a comment, to the top even though their actual karma count might be quite low (because of a lot of down- and upvotes).