Have you ever took a look at Nexon's investment report? NA Represents less than 10% of their profit, being China the greatest (something like 40%), then Korea, they don't put much more money on GMS cause they don't want to suck other maples for making GMS better, that's why they closed EMS.
Better thing in my opnion would be to make single client with server/region selection (like GMS with NA/EU, but for all regions)
