This will work in the opposite way attach rates do: it will favor systems selling well over systems selling poorly, and newer systems over older systems.
Thus, it is not surprising that the order here is Wii - PS3 - 360. I don't want to discount the significance of this analysis -- I made my own thread about PS3/Wii software selling better than they're given credit for -- but I think it's worth noting that these results are not unsurprising and don't necessarily mean the Wii is actually better for software sales.
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