Art is usually unique; I'm not sure the markets are comparable (wines have a limited run, but not so limited that two true fans will push the price into the millions.)

This study shows that some/many wines cost more, yet don't taste better. In other words, a random expensive wine is likely not great from a price-quality, or even just quality, perspective. This is relevant to the unsophisticated buyer, i.e. most of their readers.

I think you're arguing that, essentially, a well-chosen expensive wine is noticeably better than a similarly well-chosen not-so-expensive wine. I'm inclined to believe you, but that is much harder for the average consumer to act on.