@Heloise10, I follow the Amazon charts pretty closely, and I can tell you that it is not as representative of NPD as you might think. For instance, neither Wii Fit nor Mario Kart has for one moment since they started taking preorders ranked below either version of GTA4. No one really believes that Mario Kart is going to outsell GTA out the gate.
The PS3 versions of games for some reason also do much better at Amazon that NPD. For example, the PS3 version of DMC4 was ahead of 360 the entire time before the game launched.
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I follow the Amazon charts pretty closely, and I can tell you that it is not as representative of NPD as you might think. For instance, neither Wii Fit nor Mario Kart has for one moment since they started taking preorders ranked below either version of GTA4. No one really believes that Mario Kart is going to outsell GTA out the gate.
The PS3 versions of games for some reason also do much better at Amazon that NPD. For example, the PS3 version of DMC4 was ahead of 360 the entire time before the game launched.