Not sure if there are any that post here, but there are dozens of writers on odesk that charge $40-$100/hr and have a thousand or more hours billed. Most of them only average about 20hrs/wk so they are probably getting work elsewhere as well.
This is mostly copywriting so not just quickly hashed out junk to get by the filters at ezine or copyscape.
I'd never sell an article. You can make more money using it yourself. And $60K p.a is only $134 per day; if you build up enough articles on directories and sites, it's easily achievable.