Does an ordinary consumer really care about things like that other than the difference in HDD sizes and price tags? I've never seen someone attributes why PS3 is not much selling to 'incoherency' in the models outside of this forum. The 20GB model was discontinued early and the 60GB will soon. This is cost reduction & price cut which mends scooby_dooby's second point about the high entry price. And importantly, "in the first year." Anyway I don't know a historical example of $600 console selling millions.
I don't know whether it's affecting sales or not, I was simply taking issue with your claim that what Sony are doing is cost reduction. I hate these car analogies, but it's like taking out the stereo in a car and then saying it's cheaper. Well technically, yes it is, but it's not cost reduction in the accepted sense, it's by feature removal. This may not be a problem like the high price is a problem, but it can't help. Part of Sony's problem the last couple of years has been the lack of a coherent vision, and this is simply another example of that.