As was said before, it's a customer service issue.
If you look at any successful business, customer service is going to be their number one priority. Why? Because they want people to be content in any dealings with them including <b>promptly and effectively handling issues that may arise.</b>
Take a look at rule number one at this link here:
5 Secrets of Good Customer Service
Customer Loyalty
This being said the best way to get not only customer loyalty, but customers that were happy with their service and will likely reccomend the business to other people, family, friends, coworkers etc. The best way to ensure prompt effective service is to obviously have service centres located near the clientele. How ****ed would you be if you lived in EU and had to call the head office in Korea to deal with your issue only to find out they don't have a translator for the language you speak working at that particular time? So if you look at it that way, separate servers makes perfect sense.
It also seems that they're not going to be IP restrictive, and people are content with buying a different regional copy at the expense of losing the customer service, which is their perogative.
If you don't think that's valid...then I don't know what else to tell you. >_>