When your karma is high enough, you're trusted to edit questions and answers.
I rarely do it, because I wouldn't like to accidentally change the meaning or style of what other people say. Even when they're wrong, or posting stuff that's useless or pointless (there's one user here who posts adverts for stuff that doesn't work on old questions which is annoying), I prefer to leave the answer and explain what is wrong. And it feels rude to stomp on someone else's writing.
As for "why", I think Atlassian hopes that high-karma people will do some "curation" of the Q&A. I've tidied up a few good answers by changing spelling or words so that a search is more likely to find stuff. But mostly I use the edit function to remove the more offensive stuff or spam (removing the body of a spam means it can't be searched, which is what the spammers want, but the ability to just ban them means I don't need to do this any more)
I see, thank you for explanation.
Is there any information how carma opens any other features of Atlassian Answers?
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Ah, you know, I haven't got a clue if it's documented. I've had a couple of brief conversations with the Atlassians who run and support it, but I'm afraid I've never had to think about it, as I've carried high karma over from the last two systems!
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Apparently you need at least 3000 Karma to Ban users, so that might be a good guess for the cutoff.
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There's a page documenting the reputation levels here: https://confluence.atlassian.com/display/AAC/Expert+power, but I see that it's actually a bit out of date. I've given it an update just now.
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