My usual interpretation is that most users don’t read more than a fraction of the threads, and there’s a wide readership variance between threads, so a mildly interesting comment on a popular thread will get more upvotes than a very interesting comment on an unpopular thread. The karma score of all the comments in that thread encourages that interpretation.
More generally, I think you’ll do better to consider it evidence against the theory that karma actually measures anything particularly well, than to consider it evidence towards a theory that there’s some particular thing that comment particularly well exemplifies which LW users particularly want to see more of.
That sort of thing happens.
My usual interpretation is that most users don’t read more than a fraction of the threads, and there’s a wide readership variance between threads, so a mildly interesting comment on a popular thread will get more upvotes than a very interesting comment on an unpopular thread. The karma score of all the comments in that thread encourages that interpretation.
More generally, I think you’ll do better to consider it evidence against the theory that karma actually measures anything particularly well, than to consider it evidence towards a theory that there’s some particular thing that comment particularly well exemplifies which LW users particularly want to see more of.