it's almost invariably a Newbie to Member-level member who's doing it.  I don't think I've ever seen someone with a higher rank trying to pass off stolen content as their own.  I'm not saying that doesn't happen, because it does, but it's usually the noobs who are trying desperately to rank up their accounts and to get paid from some of the shittier campaigns who are the most common perpetrators of this plagiarism.  And when they get busted, they just create a new account and try again. 

It amazes me that these illiterate fools think they're just going to plagiarize stuff and get away with it, that no one will notice.  It also amazes me that people do notice, given how many users there are on bitcointalk and how many posts there are.  I'm happy that some people have very sharp eyes.