As mentioned, these sites buy up cheaper keys from specific regions were the publisher felt the normal price for a game would be too high for the local market to support it, and then turn around and sell them to people in other parts of the world for a profit.
It's not illegal to purchase them in most cases, but the publisher might seek to sue the resellers, btu that wouldn't affect you. The issue with these keys, however, are that they are sometimes tied to that original terriotry. So you won't be able to unlock them in the U.S for example, or if you do unlock it, it might have some other limitations, like being unable to access U.S version of the DLC, etc.
Personally, It's not worth it. Wait until the game is at a price point that you are willing to pay in your area. There's a Stema sale coming up in a couple of months. I'm sure Xcom will be at that same price point or even lower on Steam.
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