The MB thing seems weird. Are they going to move retainers when you move data centres? In a perfect world we would all buy and sell from the same MB. No player would feel they missed out because JP servers know how to farm X item better. Or a certain NA server has more gatherers and crafters so by far has the cheapest mats. Even though stuff has been separated it would balance in the end. The ones most effected would be hoarders and speculators.