I don't think a permanent 80 gig sku would increase sales in the long run, lots of people would probably trade a 40 gig in for an 80 gig, or the people who were going to get a PS3 40 gig, but heard about the 80 gig, delayed for a while until the 80 gig was released, hence the elevated sales when the bundle hit. I think that once the 80 gig becomes standard sales will drop down to the usual level.
Of course this is just my guess.







