Believe me or not our editor (more than a copywriter) earns a bigger salary than me, but yep, only in this way I can get nicely edited articles on the front-page of HN :D
As I noted before Karol isn't only writing stuff, this is in fact a small part of his job, he is editing/managing our other writers and he get's paid on an hourly basis.
The deal that we have is a bit more complex, but to get an idea we pay >$50 / hour.