That ultra small motherboard, those stacked battery cells should also increase the price I guess.
I agree with this as being the main reasons it's so expensive. Those are cool engineering features of MBs. However I remember when Apple used to actually lower the price of its products over time as the designs matured, and that doesn't seem to be happening anymore, which is frustrating at times. Unless they can find a way to lower the MB's price, it will remain a niche product, only attractive to those of us who prize super light weight and compact size.