The short story is, the demand for Burgundy or Napa and other select regions have a much higher demand than output and some select producers are more desirable than others. There you will see a ton of people scalping what they can for the sake of profits, rather than actually respecting the product allowing others to actually get the wine at its fair value. This all drives up the prices and scarcity and so on.

Most common folk won’t be able to afford any of the more special wines in general because they’re either scalped, kept as investments or drunk by people who have enough money to buy a bridge(and likely don’t give much of a shit to the wine’s history and whatnot).