Originally Posted by NarcissistZero
It's against the Steam ToS to buy games from cheaper regions and activate them in the West. People who did that with Modern Warfare 2 had their games taken away.
Yes that is true but it is also up to the publisher to request something be done about it. I got L4D for cheap but Valve didn't press the issue so people got to keep their games, Activision wanted to stop the practice so they demanded Steam remove the other region games away from the buyers.
You can risk it if you want to give it a go, but just know that if the publisher demands that "grey" market goods be removed from steam, steam will enforce that part of the ToS and you will be left with no recourse to get your money back.