Region Lock? Different Pricings? What are they thinking? What is the reason behind these?

Games for Windows LIVE is one of the reasons; they simply do not sell the games they fund to the gamers who live in the countries they do not support on GfWL. And I really miss the point "Why?". Publishers are supposed to sell their games, are they not? (:

As for different pricings, EA does that a LOT; at least here (Turkey). Dead Space 2 still has a 60$ price tag, Alice has 50$ and so on (US prices are 20$ each)... They want Origin to grow but these are the prices for Origin: Alice (40€), Dead Space 2 (20€). I don't know why they do this, but as a customer, I will NOT buy a product when it's %75 off in another country. I simply try to find a "friend" there; that's all...

So let me hear your opinions: Why do they exist? What are they trying to accomplish? And will you buy a game for a higher price while it's cheaper outside of your country?