I don't think there's anything to accept.
NPD is the industry accepted standard for US sales datas. They cover 60% of the market which is a HUGE sample and they have all the instruments to make a fairly accurate estimate of the total.
Remember that all the three manufacturers Sony, Microsoft and Nintendo considers NPD so reliable that they make press releases and official comments about their performance on NPD datas.If NPD wasn't reliable they wouldn't accept the datas as represenatative of their performance. VGcharts isn't even in the same league of NPD in tracking sales considering the disparity in resources and money behind them,and it would be fool to think otherwise.
BUT Vgcharts is a really useful place to get updated worldwide sales data every month and the weekly charts have the purpose to give the idea of sales trends but they need to be corrected when official numbers come out, I like this site because sales are continually adjusted to be accurate and I don't want this to end because of some kind of pride or unwill to admit mistakes.
As things stands now Vgcharts is strongly overtracking the 360 in the US market, 10.87m cannot be accurate with NPD putting the360 at 9.3 in NA, it should be 10.23 according to the 1.1 rule I'm reading here for canadian sales. And PS3 of course has been slightly undertracked.
Wrong.....NPD is the ONLY viable PROFESSIONAL video game sales tracking firm in the US market. Sony, Nintendo and Microsoft all have little choice but to acknowledge them as the primary third-party tracker, and doing so is in no way an indication of their perveived trust in NPD's numbers.
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