Tonight's bedtime paradox:
If pinocchio were to say, "My nose will now grow", will his nose grow? Note, his nose will only grow if he is lying, so if he says it will grow, knowing that it doesn't just grow, it would grow because he would be, in affect, telling a lie. However, since it does grow he would then be telling the truth thereby nullifying the statement as a lie. This would mean he told the truth, to which his nose would not grow. However, if his nose did not grow after he said it would he would then be lying, which would make his nose grow in response. I assume you all can see the circular cause and effect on this one.

The original Phantasy Star Online didn't really count as an MMO - the lobby was the closest thing to massive. It had rare drops off ob mobs that were specific to that mob that could be used to craft (in your case exchange maybe?) specific gear. For instance, a bear-like creature dropped an arm. It could be crafted into a weapon for the character that looked like one of its arms. You could likely event some kind of item exchange process. Don't forget to check for the item in the character's inventory, though.
Just my little suggestion; no clue if it is helpful.