That is actually not accurate. The original Retina MacBook Pro was priced rather high, especially since it omitted many features such as the SuperDrive, user replaceable RAM, and Ethernet. So much so, that Apple kept non-retina versions around an extra year to make sure there was a normal cost version. Aluminum iMacs have not been competitively priced in a long time. This coming from an owner of both a Retina MacBook Pro, and iMac.
I disagree entirely that the omission of those things you list devalue the product. At the time the high resolution panel was unprecedented, it came with a solid state drive, two thunderbolt ports, hdmi, and was lighter and thinner than the original. I remember doing the comparison before I bought one. Loading up a non-retina MacBook Pro to match the specs of the retina was actually MORE expensive than the retina model.