First, and this isn't really relevant, price and scarcity play a much bigger role in what is considered "good wine" than you're saying.

Back on topic, "expensive" and "price" again add the concept of profit to the value produced. The only value of wine is enjoyment, so even Petrus wine has little more value than similar wines.

That increase in value is largely labor from learning the trade and long running slow maintenance. The only part that is scarce is the soil composition, something that could be recreated with a large amount of labor. Similarly, discovering that that area produced quality wine was labor intensive as well.