phisheep on 23 May 2009
I'd guess it's not feasible - would massively increase the amount of sampling required.
And probably less accurate, as there wouldn't be the monthly cross-check with NPD.
And probably not all that informative either, as I'd guess the sales patterns would breakdown more by, say, city v rural suburban rather than by state - unlike in Europe where there are pretty massive cultural differences between countries.
