I've already seen sales data for L4D after one of the weekend sales.
The graph looked pretty much like that one, so besides the 120K preorder and the 180K first week, it's a fair assumption that it's similar to this.
you can really say that it sold for sure over 500K.
now some of your other assumptions are probably a bit high, but 800K-1M can't be far from reality.
OoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoOoO







