I was one given (knowingly to him, unknowingly to me) a glass of stupidly expensive wine and was asked what I thought of it. I thought it was very nice, but that's all. I wouldn't call myself informed, I wouldn't call myself ignorant. But sheesh .. I know one nearly-billionaire who buys cases of wine as an investment almost (but is careful with train fares - go figure) but the guy in the article does put it in perspective when he says it's like buying a £12.99 bottle (compared to 'ordinary' people) for them.
I went to a wedding in Tuscany last year at a vineyard. We drank the red, which was, by all accounts, retailing at about £200 a bottle. My wife loved it, but I was emphatically not fussed by it at all and would have been pretty pissed if we'd bought it. But then many Italian reds have that rustic taste that do nothing for me.
It is ultimately subjective. I guess a wine master will have more understanding and will also have "trained" their tongue, but you can't change what your tastebuds like. The problem is that there is just as much horseshit as there is truth in wine - it makes it what it is.