Read the notes from above concerning attach rates... Yeah, GT series sold millions but was between 7-12% attach rate for the install base at the time. The Various MK series were between 18 and 30%, again, based on the numbers posted above. On just attach ratio alone, MK will win in a big way. I would compare the Wii to a Gamecube in terms of purchases of the game so I'd look for Mario Kart DD (cube) at 30% attach as the minimum on a global basis. (assuming the game is very, very good)
Assuming the install base remains the same percentage difference as it is now, on a global basis until both games launch, MK will sell 2.3X more copies of the game assuming an identical attach rate. If the historical attach rates hold, then that number will be even higher... 4-5x more copies...
Again, I'm not knocking GT5. From all accounts it looks like it is going to be a stellar game but I just don't see the numbers justifying a snowball's chance in hell of GT5 outselling MK by any stretch of the imagination.








