Looks like there are some more restrictions with the auction houses dealing with real money and actually has a good benefit as a result.
While the game is region free, auction houses are locked to specific regions as a way to prevent Chineese gold farmers from scamming non-Asian regions and people buying items with different currencies than allowed in a region.
Quote:
* Diablo 3 is region free. You have a default region (based on your address), but it can be modified to play in another region (think D2).
* You can use every gold Auction House.
* You are restricted (locked) to a specific Real Money AH based on your address when you activate your game.
* You may move region providing proof of habitation (not 100% sure).
* These apply for EU/NA 100% some things may be different for Asia.
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http://www.screwattack.com/news/diab...n-houses-arent