Good principle but it let us down in this case as I've posted the most valuable comment here and it has no replies at all! :)
The EV includes the value of the root comment. If that's large enough and there aren't any bad replies adding negative value, you win :)
(Just to be clear, I'm using EV as a pseudo-technical metaphor. But it's a surprisingly good one, and could maybe be turned into a real model.)
That touches on an important principle actually. The value of a comment on HN is the expected value of its subthread.
https://news.ycombinator.com/item?id=21347871
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...