There are several insightful posts, like this one:
"Ask HN: How are lean startups easily accepting CC payments?"
http://news.ycombinator.com/item?id=2444709
As well as other ones where the submitter is soliciting advice from other HNers, or else threads where HNers are sharing their experience with some technology.
In comments like these the up-vote is used to say "I agree and share the same experience." Since replying with "I agree", etc is frowned upon, the karma makes for an important tally in determining how many people agree with the statement or share the same experience. Whats the ratio of people who like service-foo to service-bar?
In the topic on Rails 3.1 shipping with CoffeeScript, one comment starts:
"After a few months of CoffeeScript development I vastly prefer it to JavaScript."
How many HNers feel the same way? 2? 55? 109? Without comment karma shown I have no idea how many people agree. For all I know, nobody feels the same way.
"It's hard to debug when you get compile errors"
How many people have had this experience? I no longer have the rough tally of karma.
I think HN is missing fairly valuable information from not having the comment karma shown.
Thoughts?
Perhaps showing both upvote and downvote counts would be useful. A comment with lots of vote that average out to close to 0 likely adds more to the conversation than one with very few votes in either direction.