Although the infoscout data is close to what I expected, I still think some people are putting way too much stock into their numbers.
Someone needs to tell the users on gaf that just because they're using 250k receipts doesn't mean all of those receipts (or anything more than 1% of them or so) are related to game purchases.
Still, it seems fairly safe to assume that the relative price parity (plus the $100 discount from last year) helped the PS4 quite a bit.