I'm sorry if I wasn't clear in my tone. I am not bashing Apple, I am a stockholder and I want them to make a lot of money, as well as change the world for the better. It is very likely that Apple computes a margin on the total cost of components, and then looks at the market to determine the best price to sell something at. In the case of the iPad, it is likely that the cost of several components other than the screen were costing less (as well as R&D) a year into selling it. Also, raising such a memorable price as $500 would be a marketing mistake that anyone could see. So even if their margin had to suffer, they would have to maintain that price.
In the case of the Macbook Pro, so many people order it in so many configurations, that I don't think there is a 'magic' memorable price attached to it. I don't remember the price I paid for the one I have.
Also, so many other components are changing from the earlier model: the case, the hard drive to solid state (or not), the elimination of the optical drive, maybe a solid state boot drive + 1 tb hard drive (my wish list), thunderbolt, USB 3, and so on. So the pricing will likely start from scratch. In the most recent book on Steve Jobs and Apple, the author contended that Apple never even thinks about price when designing a product; they simply design it the best way possible, and figure out the price when it's finished.
Also, my (poorly worded) final point is that many macbook pro users such as myself, are pro film or photo or music users who are frankly wiling to pay any reasonable price to get the best machine possible. I'm eking along on what must be my 5th apple laptop, but it is 3 years old and has been dropped several times. I love it, but it's too slow under Lion to work effectively on photos or video. I am dying to get the next model (I waited for USB 3 and two thunderbolt ports, rather than one, to hook up my older display), I will load it up, and frankly, I'm desperate enough to pay anything they want.