There is a way to trade items and dupe them.
Basically what this does is the server has no idea where you are, or where you are supposed to be, so it won't log you in.
You can't log in until after the next server maintenance with that character, but when you do, it logs in you from the last autosave before you blackholed.
What this does is gives the person whom you traded the item, and you have it after server maintenance.
I haven't tried putting the item in the bank and blackholing the character yet, because for one, it takes a day to dupe something and I think the bank is tied to your character as much as your inventory.
I'm going to play with this more. If anyone is interested in this pm me, but I'm not letting it out that fast yet, unless you have something interesting to trade