Ok so I thought of this last night and tried it out, it worked very well. Not sure about if its bannable or not, but so far nothing has happened. Here is what you do.
1.) Use 2 accounts
2.) Have a level 70 character (preferably an alt whose reputation you dont care about)
3.) Create a level 1 alt with a name very similar to your characters
Example : Loxiali and Loxilai (you get the idea)
4.)Park your level 70 in front of the org AH sign and your level 1 somewhere else in org that is out of sight, like cleft of shadow or whatever
5.) Long on the level 1. Find someone in trade chat that is saying wtb belt of blasting or nethercobra leg armor, have mats, pst. Whipser them and tell them you will do it for free.
6.) Tell them you are in front of the auction house sign and to hurry because you need to log
7.) It does not work everytime but now what will typically happen is they will go up and trade with the level 70 (thinking its the person that messaged them cause it looks like the same name and is in that spot) the mats required to make the item. Accept the items and do not say anything, the items are now yours to keep.
I'm pretty sure this is not bannable if you use seperate accounts because if someone just trades you items for no reason you are not required to give them back. However it will hurt your rep on that server
Good luck and have fun with this one.