Not one of you has given a good reason why. Why should the successor to a 300$ card be priced considerably higher? Why is +60% on a new node completely unrealistic? If you follow this logic, chips will become faster but more expensive. So in 5 years we have +200% performance and +200% price? That is completely unrealistic.
I don't get why you deny that perf/$ will increase considerably - as it did with every new generation eventually...in every market segment.