as far as the numbers game goes (and this is really just a hypothesis), I think that the numbers have to do something with residual (for lack of a better term) sales.
ex: Numbers crunchers and analysts look at many other games first day sales and create a graph showing with some certainty a correlation between first day, and lifetime totals.
1million on the first day= 8+ million total sales
.9 million on first day= 6 million total
.8=5mill
and so forth. This might be completely wrong but i'm guessing that there may be factors such as hype, consistency, popularity, and the like contributing to a figure that has not really been mentioned.
Although, I think it might be more possible that one million on the first day covers all liabilities, and that graph thing i was talking about gives some indication of profit and or likeliness of future exclusivity.
