Various reason, software piracy rate in Malaysia is at 60%, hasn't gone down since a decade...one of the reason why even Microsoft don't want to bring in Xbox. That, coupled with weak enforcement and law.

Market in US is damn huge, launch a USD7 game ... by a week, there 1 million download...$7 million...I haven't bought any games yet on the eShop...won't put in my CC, prefer to go buy a giftcard but the games looks pretty awesome.

It's nothing personal, they won't invest if they can't recoup the investment.