You are fixated on the 15" screen.
Imagine this:
Apple Automobiles has two models of 4-door sedan in production:
- The budget sedan they've been making since 2009, the CL. 2012 base model sells for $16,000
- The luxury sedan they've been making since 2012, the RE. 2013 base model sells for $22,000
In 2013, they announce that they have made some upgrades to the RE, and they are lowering the price to $20,000. They quietly discontinue the CL.
Your argument: "They raised the price on their 4-door sedan! How can anyone call $20,000 less than $16,000?!??!?!??!?!?one!!!!?!??!?"
Everyone else's argument: "Dude, they discontinued the entry level sedan and lowered the price on the luxury sedan from $22k to $20k..."
Your rebuttal: "But that means I can't buy an Apple Auto Sedan for less than $20, so they raised the price!"
So if ALL you look at is the fact that the cMBP and rMBP both had 15" screens (or 4 doors), by discontinuing the cMBP they have made it more expensive to get a 15" (4 door) vehicle.
But they did lower the price of the rMBP (Luxury), which had a number of features that the Budget model did not.
I understand where you are coming from, but there are a ton of differences between the old base models:
2012 Classic vs
early 2013 Retina 15"
1440x900 vs 2880x1800 screen
4GB RAM vs. 8 GB RAM
500 MB 5200 rpm HD vs. 256 GB SSD
GT 650M 512 MB vs. GT 650M 1 GB
DVD vs. no DVD
Apple was comparing the new base Retina with the old base Retina, since the Classic and Retina already differ in so many other ways, even if they are both made of aluminum and have a 15" screen.
Yes, if you want a (current model) 15" laptop from Apple, you now have to buy a Retina model. Yes, that Retina model is more expensive than the previous Classic model. But in the end, Apple did lower the price of the Retina.