Why not at least the option for 1 GB of VRAM on at least the high end 21.5" and low end 27"?

in Current Mac Hardware edited January 2014
I get that Apple wants to charge a premium but I question why at least there is not the option of doubling the VRAM available?

They don't usually do anything for the base model which I guess I understand but why not the other three?

Figure you up the high-end 21.5" from 512 MB of the 650M to 1 GB for $150? $150 also gets you 1 GB of the GTX 660M on the 27"?

Am I wrong here?
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