Can you imagine how much cheaper you would have to manufacture your game in China to offset the shipping costs to the US? If that is your target market.
If your market is mostly China, Then I could see that happening. Heck we have enough problems with handling the games properly to get them undamaged to customers here. Can you imagine how much handling is required from an over seas manufacture? Twice, three times as much, more... The bottom line is profitability.