Nice way to look at things.
Will comment that this is skewed significantly at the "launch" of a console, as hardware is limited. The first week figure for several titles will be incredibly low, yet it may keep selling indefinitely (i.e. WiiSports in Japan is probably like this?).
...
I was considering drawing up a bunch of "sales graphs" (cumulative sales over time), then normalising them to say, 100k in first week (or first month).
You end up with a bunch of differently "shaped" graphs. We could then identify the factors that puts a game into one of these categories, and we can use it to estimate lifetime sales of any title once it launches.
(but I don't have time now - maybe a project for later...)
Gesta Non Verba
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