RV770 was pretty killer in price/performance.
I'd say a significant reason the current gen isn't as cheap is because Cypress itself is bigger than RV770 (~330mm˛ vs ~256mm˛).
Not to mention they use 1GB GDDR5 as standard, and also the PCB/PWM is more complex this time.
And for Nvidia, GF100 has been tough to manufacture. Yields will be preventing decent costs.
Though 5xx0 does have the advantage of great performance per watt (RV770 was somewhat lacking in that area)
2 x underclocked (to reduce heat and power consumption) 5870's really (1600 shaders vs 1440)
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