Simple maths are irrelevent.
When people talk about the attach rate, it should be taken into consideration based on when the actual game was still selling itself, and there are other factors that can be brought into the argument as well.. GT4 didn't sell as well as GT3 and there are many potential and reasonable reasons for that. For one, many could have seen it as not big enough a step up to warrant the purchase of it, having spent the countless hours of gameplay on the first outing of the console already, and not willing to do it all over again (the game still sold over 10 milion copies anyway). It could also be that the franchise had become a bit stale in the mind of gamers and they lost interest (it still sold over 10 milion copies). It could also mean that because the PS2's install base is so huge, so is the diversity of gamers preferences going to be huge. Or, it could be all the above combined or any other speculative reasons I didn't brought up here.
GT5 is gonna share more in common with GT3 than with GT4. The main point being that GT5 is, like GT3, the first main entry in the series on the system. GT3 sold more than GT4 on an intsall base way smaller than what the PS2 is right now...
Original post: http://gamrconnect.vgchartz.com/post.php?id=3496837
