[andrewaylett]

It's definitely dealing in edge-cases, and I think there's a middle-ground where you make sure people are aware of the edge-case conditions they're approaching, without necessarily irritating people to whom they don't apply.

So on the one hand, making it clear what the region you're buying into actually is would be really nice, and on the other hand (as suggested) making it clear when you've crossed into an edge case and there are things in you're account that you're about to lose access to, or that you might expect to see but can't, would make resolving this kind of issue much easier. And wouldn't bother the 99% of people who haven't switched their account region after "buying" something.