I endorse this post strongly. I too have occasionally had some informative back-and-forth's in buried threads. With this update, this would only work if both users have >1000 karma.
Additionally, people may be more willing to have these conversations if the comments made in old threads didn't impact their average karma. Long ago I decided I didn't care about average karma and just try to add something to a larger discussion or attempt to have a conversation in an old thread, but in the beginning I was concerned.
The back and forth comments deep in threads no one reads are some of the most interesting I have had.
That'd be nice, it explains why my avg karma is still less than 2 while I also get quite a few upvotes.
On the other hand, if I'm having a useful discussion with someone in an old thread, I often give them an upvote for their troubles as well. It's not like it affects the sorting or anything.
