Apple are known to take much bigger margins than competitors on their hardware. The reason has actually been given by Jeff Bezos during the Kindle HD announceme

Apple are known to take much bigger margins than competitors on their hardware. The reason has actually been given by Jeff Bezos during the Kindle HD announcement: Amazon wants to sell their ecosystem, their ebooks, movies and music; the hardware is only a gateway to allow users to buy from their store. Apple makes money on hardware itself and needs a bigger cut (even if they have an ecosystem on their own, much bigger that is in some domains).