I dont know if this has been posted before, but i just wanted to make another contribution, i noticed this by accident..
First: Craft something from Tailoring, LW, BS JC or anything which has socket in it..
Second: After getting an upgrade, you buy some new gems that you want to socket your new item with, and by "accident" you put the gems into your -> Craftable item <- which has become soulbound after using it.
Third: You ticket a GM, and tells him that you socketed the wrong item and want a reimbursement of the items.
Forth: The GM contacts you, and delete the items from your character and afterwards he will send you the craftable item, plus the gems.
Profit: The craftable item is now BoE again, and can be sold through AH or Trade.
If you happend to know its a repost, please be kind to link it =)