How is the rMBP overpriced? It costs $500 more than the cMBP, and the screen costs Apple $380 more per laptop. The computer features an advanced redesign from the ground up and years of research and development.
Apple is essentially giving you the upgrade at COST, or BELOW their costs + R&D. The higher speced versions are also a bargain compared to the cMBP, with most of the upgrades costing LESS than it would cost you to do them yourself instead of being heavily marked up.
On top of that the rMBP has a much better resale value than the cMBP.
That seems underpriced from every single possible dimension.
The rMBP simply has much better value for money than the cMBP, it just happens to be more expensive.
This is like me giving you 5 pounds of potatoes and charging you $10, and then giving you 10 lbs and charging you $12 and you saying it's overpriced.
Perhapse what you meant was "the amount of added value is not worth the small increase in costs as my needs do not benefit much from the Retina MacBook Pro over the Classic"