Sounds like a ton of ****.

Better off editing the files in the Aion folder and setting it up some how. :/
I play gamezaion and there was a guy who dupped +15 taha, but after a week he stopped and never shared the secret. Sooo idk...
But I did see a guy sell an uber rare item back 2 back. He had like 90 of them in auction which shouldnt even be possible. But that was a few years ago. :?
Nevertheless, my personal take on duping is,
trade a friend, drop item, click ok, then as you click confirm d/c yourself and log back in and see if it worked. (all theory)
I wonder if you could use CE to find Kinah values so when you sell and item it sells for the desired price. :P
idk...
If someone does know how to dupe, release it. **** the game's economy. It's all about pvp anyways. Might as well make it a real beast of a war game!