I'm not knocking people that write for others but. I can't help but think it's kind of like the "SEO for hire" guys. I thought about doing this at one point but , why write for someone else? It's time consuming and your time would be better spent writing your own copy.
You can't help but think they are just morphing your posts out anyway like most of the entire internets
When you write your own you don't have to worry that it's been "duped" already. I know some people probably just want to sit around and write for other people but like SEO if you're so good why aren't you doing it yourself? Just a thought ...