Except you can't really use MBA launch prices as a good indicator. No doubt the MBA push the market and they invented the ultrabook. Those days are long gone and the MBA is now easily considered their budget machines..
Yes, they are. But just because they are old and have not been redesigned. In 2012, the retina MacBook Pro was introduced to stratospheric prices as well, and became cheaper as time went by. Now, the remaining retina Pros are also in a sort of "budget" category. It happens with all Apple products. Every year, Apple launches a new iPhone and drops the prices of the existing models by USD 100.