There are none so blind . . .
A 256 GB 13" rMBP is $1999 or $1899 with student or gov't/military discount. The base 13" cMBP is $1199 or $1099 with student or gov't/military discount. The difference is, if you can follow basic arithmetic, $800. What does that get you? Half the storage space, but faster storage; a better screen, and 8 GB RAM (of which 768 MB is used by the HD4000 vs. 4 GB. You also have the ethernet and firewire ports removed, along with the optical drive. In return, you get a somewhat lighter and thinner laptop.
Those differences don't strike me as being worth $800, particularly when many need an ethernet port and an optical drive, and think it absurd to buy an all in one laptop that then requires an adapter for ethernet and an external optical drive.
As I said, nice computer, shame about the price.