However, it still seems obvious to me that whatever your definition of QPR, at some point the incremental cost starts increasing dramatically relative to the perceptible quality (no need to assign points for that generality). And, even though what we discern as quality differs from person to person, it seems reasonable to me to suggest that for any $100 or $300 wine, there's something out there at a significantly lower price point ($20? $30? $50?) that would approach that level of quality or enjoyability for any given drinker.
Although I understand the argument that the a person who has significantly greater disposable income might see the additional expenditure for the $100 or $300 wine to be much more acceptable, I'm not convinced that is the same as saying the wine offers a good QPR, since the $100 or $300 wine still costs significantly more for a similar level of perceptible quality (assuming that we can agree the one can find a lower cost wine that approximates or approaches the same level of quality).
And, of course, that doesn't even confront the issue that most people, and probably even a large number of us here, wouldn't be able to consistently blindly pick the higher cost wine as better/higher quality/tastier/etc. Hence my point that this is really an issue of rationalization (we convince ourselves that the higher cost wine is an acceptable value for a variety of reasons).
Having said all that, I'm not necessarily any less subject to shelling out more than I should than anyone else here.

