Ok, now we're cool.
There's a restriction on new members posting sigs. You just needed a certain number of posts.
Honestly, I don't disagree with your analysis of 7000-series performance as much as I do your suggestion of what constitutes a good upgrade. 30-40% faster for $250 (after overclocking)? Bad value in my opinion.
Would it be more consistent to use relative comparisons for both the increase in performance and the increase in price?
It seems to me that this analysis is thrown off by using a relative comparison for performance increase, but an absolute comparison for price, instead of looking at the symmetrical metric of relative price increase to match the metric of relative performance increase.
So extending this to the price, you'd compare the 30-40% relative increase in performance to what the relative increase in price would be, by asking what would be the relative increase in price to get the new card - you could sell the old card, and use that money as a starting point to see what the relative increase in price is - what is the additional cost of getting the new card after selling the old?
So maybe he will spend $100 additional, after selling the 5850 for $150, to get that 30-40% increase in performance. It still seems to be the same outcome of the anaylsis (higher increase in price than performance), but just not as mismatched/unbalanced as the original analysis that failed to apply relative increase to price when comparing to a relative increase in performance.