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Squilliam said:
Wait... Xbox Live usage was about the same as Steam usage? That must mean the game sold relatively similar amounts at least up until the half price sale.

That would be hard to say.  I would guess that >90% of Steam gamers would play the game online and this number would be less on the 360 version.  Although I would still assume that a significant amount of people actually purchased L4D on PC.  After the latest spike, I would assume the numbers must be reasonably close.  It would be nice if Valve could release some Steam sales numbers so we could work with something more tangable than assumptions based on a graph of online users.