Agreed, although you don't *have* to get it directly from Steam -- the Amazon download version is a Steam key. I suspect that Valve gets part of the commission for those, the online retailers and other digital distributors have been trending towards selling Steam keys of games even when they aren't Steamworks titles because they're much more popular.
You're right. The only part I care about is that it registers through Steam. I always see these threads for Amazon or Greenman, and I always hope that they're selling Steam keys.
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