Sorry for the double post but I have a potentially amazing idea.
I play quite a bit of MMO's, and one thing that is holding trading back in a weird (and small) way on PSObb Ultima, is meseta limits.
I propose an item called a Check.
Available in Item shops to purchase, worth 100k, 500k and 999,999 meseta. This way you can trade meseta, store meseta, without limits.
Already have 999,999 in bank and on character? Buy the checks, store in bank, voila. Sell the item for that amount of meseta later on when you need to. I doubt this is really a problem for Veteran players, but I am running out of meseta already, and if I could trade and store more meseta, that'd be awesome.