Here is my exploit again that was deleted it was from my clans website.
This bug takes 3 characters to complete. 1st character will call the duper... Take your duper to his house along with a stack or 2 of somethign you wanna duplicate. I did 8 stack and thats why I am banned

( put the items you would like to duplicate in your vault and open up your store and set the prices ( I set them to 1s ) . Now exit your house, once you are outside of the house double click on the door and relinquish ownership. Now your done with this character for now...
Do a /quit to goto character select screen and log on to 2nd character, we'll call him the buyer. Make sure which ever character you are using for the buyer has nothing for sale in his vault or it will bring the duper's items offline.
Now run your buyer to a broker and type in your duper's name in store owner and search. In order for this to work you have to leave 1 of each stack, so only buy 19/20 .
Now we must bring the duper's items offline to refresh them. This is where your 3rd character comes into play, we'll call him the "reset" . The reset must have an item in the vault and up for sale. So when you log onto the reset the duper's items come off the market.
Now log back on the duper, /quit , then log back onto the buyer, buy 19/20 of your items, /quit , then onto reset, /quit ... etc...