The flaw in most peoples arguments is that they assume only their solution to the slight increase in software is the answer when it reality its a combination of them all most probably.
Yes Batman was released the week before, which inflated the usual ps3 software sales.
Yes some hardcore ps3 fans upgraded (which ioi talked about, which lends some much needed validity to that argument). Especially in Japan.
Yes some people probably only bought some used games
Yes some people might only be buying it for the BR functionality (less likely though)
Is it so hard to believe that its a combination of all of these to some degree?
Not really.







