If I spend twice as much will it be twice as good?
Yes ... no ... well, sometimes. A 6 (euro, pound, leva - doesn't matter) bottle of wine may well be twice as good as a 3 bottle ... and a 12 bottle twice as good as a 6 one. Over and above this level though the value for money becomes more subjective. To a degree, you're paying a premium for perfection because it's so rare and so hard to achieve. You need therefore to buy with caution to avoid expensive mistakes.