It will be interresant, what you say, because yesterday, microsoft speak about an attach rate of 6,1 in US (give by npd). But, attention, there is not all 360 games in vgchartz data (earth defence force 2017, Virtua tennis 3 , rapala trophies for exemple, and maybe : tetris evolution, robinson, ....), so even if, ioi give the total you speak, it will be a bad indication to calculate the attach rate.
In other hand, if we discover with the total of ioi an attach rate superior to 6,1, it will say that the sales of game are overestimate. So, i wait this total for the reason of the attach rate. When i see the total per week, an attach rate largely superior to 6,1, will not suprise me with actual vgchartz data. This week for exemple, vgchartz give an attach rate of 10 for the 360. So overestimate sales of game for 360 is maybe largely possible in vgchartz data.
Note that one week is not suffisant to calculate an attach rate, but i see never a week with an attach rate under 6 recently. So, interresting subject, because npd give the attach rate.
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