I really enjoy the content this site offers and I'm glad it exists even if numbers aren't 100% accurate but just face it: in case of doubt, NPD has 60% direct data and as for the 40% they estimate they've doing it for decades. If anyone is off, is this site.
Dolemit, there's a slight difference involved between extrapolating from 2% direct data and extrapolating from 60% direct data.