Given that most people think that the Post-PC era is on, it makes sense for Apple to continue its Mac pricing. The tablets and smartphones are anyway eating into the low end of the PC market:
The conventional wisdom is to pursue profits by maximizing market share. Apple pursues profits by specifically targeting only the high-margin segments of the overall market, and effectively forgoing market share in the low-margin segments, no matter how large those low-margin segments are.
via Daring Fireball: Pricing and Profit Consistency and the Halo Effect.
AB's Reflections 