Items can be classified into tiers. Top tier items: the very best are "Bind on Acquire". You earn em', you own em. no other way to get them. Second tier items: Good enough for most of us. "Bind on Equip". You can buy them, but use them once and they are character bound forever. This actually creates more crafting demand. Third tier items: Resources, consumables, and everyday items. Freely traded. I know well that the devil is in the details and what ends up in each category but first, consider it as a concept and how it changes the feel and play of the game. Could you support it? (This is the system, btw, used by most modern MMOs to help discourage trading related issues).