Edukator- bit late coming back to this but I think you deserve an answer.
I suspect you are implying that great wine is as much subjective as objective. We’ve just had a very pleasing 2001 Gigondas – I loved it but can see it is a good (but not great) wine.
Hopefully a £30 bottle in the UK will be technically very good even if it is not to everyone’s taste. And someone who “likes their wine” will get more out a £30 bottle that isn’t exactly to their taste than a tenner bottle that is. For example I’m deeply sceptical about mid-range Bordeaux (maybe £30 a bottle), but if you give me a very good Rhone then I will almost always love it – and if it doesn’t say “Hermitage”, “Cote Rotie” or “Chateauneuf du Pape” for that sort of money it will be very good.
Similarly I will state categorically I’ve never spent a tenner on a red Burgundy or Bordeaux and be happy (acid PN and medicore CS or Merlot).,
I will be delighted with (for example) Sainsbury’s Taste The Difference Cotes du Rhone Villages at about 7-8 quid. Unfashionable areas rule for me. I am trying to learn Bordeaux but cool(ish) climate Chilean CS always beats left bank of Gironde and Merlot based wines have never hugely excited me if I am honest. Such is life, and such is wine.