This search - http://www.hnsearch.com/search#request/all&q=downvote+th... - gives several places where your question is answered.
Would like to see down-vote capability weighted much less on submission up-votes and more on comment up-votes.
Yesterday, someone noted how many repeats there are of popular stories on the front page; I would posit that this is, at least in part, related to the karma value of up-votes on submissions.
My point was that the 500 point threshold should be calculated differently. If a user receives an upvote on a comment they submitted, it should be more valuable than an upvote they received on a news item they submitted. Currently, both count equally towards the 500 point threshold.
This would make it less appealing to submit (already popular) articles just for karma benefit.
It's specifically and deliberately user hostile. People unwilling or unable to make the effort or take the time usually get frustrated and leave, or ask questions and get enculturated.
You're not expected to understand everything instantly, and the usage of these things is expected to change over time anyway. Their purpose wasn't set in stone to begin with, and already has changed. For example, the down-vote used to mean "This doesn't belong on HN" but has evolved to include "I don't agree".
And flag does more than just act as a downvote on submissions - it indicates that the item shouldn't be on HN and is used for spam, troll, seriously off-topic, and by some, for repeats of recently submitted stories. Enough flags and a submission is auto-killed.
But ambiguous UI elements aren't going to have that effect. People will generally either misuse them habitually or ignore them. The human mind is awesome at filtering out noise.
Onetime I noticed that my karma went down but I could not tell what comment was downvoted. It could have been a learning moment but instead it was a mystery.
In the extreme case, any user can tell if a comment has negative karma, because the comment starts to gray out. No comment receives downvotes for more than twenty-four hours.
What does this mean:
"no comment receives downvotes for more than 24 hours."?
"no comment receives downvotes for more than 24 hours."
This means that the downvote arrow is only visible/enables on a comment for 24 hours. Once a comment is more than 24 hours old you can no longer downvote it.http://news.ycombinator.com/item?id=2817899
I posted a link to a law review article and the link was downvoted. It does not make a lot of sense why...