Windows Phone OS and International Availability

I just don't understand WHY Microsoft doesn't make Windows Phone based smartphones and WP related services available for every major country.

Just in case, I'm living in Turkey and I know more than 10 people that pre-ordered iPhone 5 via their friends in USA to buy directly and send them. It's 9th biggest economy in the world and fastest growing economy in EU. There are lots of freaking tech maniacs that don't have a clue what iMessage is (example) and they are paying 2x -3x of their salaries for the world's most expensive iPhone, costs more than 1300USD)

MS and Nokia have so much to learn from Apple.