I was thinking a really long time about trying to make a "leg" formula and I came to the conclusion that there were to many variables that determines legs...
BUT, one thing I did decided on was it would not be just the first week, but the first 2-3 weeks...
The problem I ran into was games like Halo and Pokemon, Which each sold over 4 million launch week world wide so their % will be skewed even though they still enjoy solid sales week in and week out. They have legs even though their % would be jacked up... then there is games like Cooking Mama which actually chart lower than halo or pokemon but would have a MUCH Better %
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut
