I'm interested to see how they did it. I'm open to new data and changing my mind (I have done several times already, and used to be insufferable!) but I want to see several studies with good method.
I see you're not denying that more expensive wine can taste better, and I misread this at first to think that you were denying any possible objective (conventionally-agreed at least) values for "higher quality" wine and that it was all bull. You haven't said that, and so I think you're not contesting that, but just noting the market's strangeness, that there is no relation in price and a wine's agreed quality.
Correct! Price correlates with rarity and place of origin and all sorts of other neat stuff, but as far as 'will I like this wine?', ain't no there there.
That said, individual people should buy based on their tastes - but a $20 bottle of Burgundy wine has even odds to be better than a $40 bottle of Burgundy. The only way is to try it!