People who buy Apple don't care about value either, its the status of the product. Apple's marketing base is based on the status of their products. I'm sure people would start to wonder if Apple did lower prices for their products. Its their niche, why reduce it and become the HP, or Dell or Asus? AMD stuff works well for their needs, and its not like most people will pay attention to what GPU is inside it anyway, as long as it works well.
Or do people actually care? How is Apple's sales of late of laptops and computers?