I'm not sure why you're surprised that a device that's not intended (yet) to be sold outside the US, doesn't allow app support outside of the US (yet).
Having said that...my experience is that if your one-click billing address is US-based, it doesn't matter where you are in the world. I know this because my GF is canadian. Making HER card the 1-click makes it so I can't buy apps...even INSIDE the US. Making MINE the default, allows me to buy apps...even in Canada.
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