It depends on what "true" means. That there are diminishing returns to investments over a threshold? That's probably true of all these luxury goods. Past a certain point in whiskey, you're not necessarily paying for "better" so much as chasing some interesting distinction (a particular sherry note, an especially punchy cereal flavor in a high-proof bottling, &c). In each category of whiskey, there is a satisficing price point, and serious whiskey drinkers would (perhaps unlike wine drinkers) pretty uniformly tell you not to depart that price point without a good reason to.