Bear with me here.
According to VGChartz, GT3 sold just shy of 15 million. The PS2 is at 123 million right now. Quick math puts GT3 roughly around the 12-13% attach rate mark, if I'm not mentally challenged. Now let's say Wii Sports Resort sells 12 million. Could sell a lot more, but I'm being modest. Now let's say Gram Turismo 5 sells more. Let's put it at 13 million. This year the PS3 sold about 10 million units, so next year let's put it at 12 million to be nice. That brings the total to 30 million. That's an attach rate way higher than 13%. The best selling entry in the series on the best selling console of all time is at 13%, and people are expecting GT5, on the worst selling of the 3 Sony platforms to push an attach ratio of well over 40% in less than a year?