Although seemingly difficult for profiteers, seeking to make a quick buck as myself. Don't do it, don't be affiliated with the exploitation side of WoW. Some of you may say, "Well duping doesn't exist so I'm fine" The clear response is NO. I do not want to go into details here, but the duping is happening on blizzards behalf, due to persuasion of mischievous players. Another clear approach would be "Well, until blizzard fixes it I'm gonna keep making quick gold!" There is a back-end system that will come through and delete duped items, even if their now in your hands, and you paid!
What can you do to prevent these malicious scams? Simple, Avoid them, if something seems to good to be true it probably is! If you are weary of a person, and believe it may be remotely duplicated, please contact a GM asap. They are there to help and assist with any problems you may have. I personally have had my gold fully restored and items removed after learning of their dupe. The process is fast and, for the better of the community. Help in the fight against the scammers!
-Oso wants you to avoid the scams at all costs!-
Thank you, Osomu