I don't think that's how this work.
DS+PSP HW = 230M
3DS + Vita = 52M
DS+PSP SW = 1B
3DS + Vita SW (considering your digital sales) = 160M
DS+PSP rate = 4.34
3DS+Vita rate = 3.08
Now imagine they have the same attach rate with some guessed numbers
3DS+Vita = HW - 100M
3DS+Vita= SW - 434M
It looks like trouble to me. A drop bigger than 50%.
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