The day you guys run a company and want to do an international contest only to realize how insanely difficult and costly it is you'll stop complaining.

These restrictions aren't done because SE hates the rest of the world, it's because setting up contests with actual/physical prizes aren't easy to organize at all and all sorts of international laws need to be considered including things like age restrictions, value of the prize (some countries will allow more, some less) and pretty much every little detail.

So seriously stop crying all the time, it's not their fault. I've had to run contests in my line of work before and you have no idea how difficult it is to run these things (legally).

They also might be planning to do other similair/identical contests for other regions and just haven't posted them yet?