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Slimebeast said:
Too many unknown variables to arrive at 1 mill for L4D. It could just as well be 300k.

Nice try though.

No, it couldn't be as low as 300k, because then it would mean that Garry's Mod, without any weekend sale, sold more copies in it's first 2 years than L4D did in the past year...

Garry's Mod sold 312k units from 29/11/2006 to 29/11/2008.