I think OP's point is that a base 15" Haswell rMBP is $1999 while a base Ivy Bridge rMBP can be had for $1599. That's a 25% price increase for an actual regression in GPU performance. If GPU is important to you it absolutely makes no sense to pay a 25% price premium for worse performance.
The flippant, sarcastic comments about "Core 2 Duo is cheaper" or "Sandy Bridge is cheaper" aren't taking into account that the successors to Core 2 Duo and Sandy Bridge were still an improvement in every possible spec over their predecessors.
This is one of the rare situations where a current-generation was actually worse in some ways than the model it replaced.
Where do you see it for $1599?