And it seems that something like the 90-9-1 rule is in effect - with over 7,000 comments, the top non-dang contributor is more than 100x as prolific as contributor #10,000.
Quick calculations... 2735447 total comments in that top 10k.
The top 20 percent represent 1519843 of the total comments, or just over half (55.56 percent).
Though at the top 2k, you're still writing 359 comments per year which is a lot, so I guess the real list going down to comment count = 1 might look a lot more like an 80/20 split.
Would love to know the distribution by karma as well, yeah.