Hey
This is something that happened yesterday.
Code:
I bought an item by mistake (namely http://www.wowhead.com/?item=29194, 100g to buy, 25g when sold), and paged a GM.
He said that "sure, i've deleted the item from your bags and you will get the gold back through the ingame mail system", which i did.
But before i did any of that, and althrough the GM had deleted the item, i thought, what the hell, lets try sell it (since i could still see it in my bags).
I got disconneced, but when i logged back in and picked up my email, i was 25g richer then before i had bought the item.
This gives increased profit through higher vendor price, and i found http://www.wowhead.com/?item=29171 to be an excellent item to use this with.
Since it worked for me (two days ago) i'm pretty sure it should work for everyone else aswell. If not, please, tell me. : )
//kitash