I don't think it really matters with Amazon. I mean considering the type of people who shop Amazon it wouldn't surprise me that they wouldn't want down the stripped down version of the PS3.
I do think the 40 gig might not help as much as people think since BC is a pretty big deal for most people (including those with PS2s.) Still should have a good front end boost, but i think it might have a quicker drop then you would expect this kind of thing to have.