Players would only use it for items that they couldn't sell on the AH at a profit over vendoring. And in that case, they'd more likely vendor it to have gold in their pocket.
Idea would not work.
The Book of Ghost Crab:
And he led them out until [they were] over against Orgrimmar: and he lifted up his hands, and buffed their classes. And it came to pass, while he buffed their classes, he parted from them, and was carried up into the Emerald Dream. And they worshipped him, and returned to the General Forums with great joy.