Why on Earth would an oil change cost $2000, or even $400? Are these stealership prices or something? What keeps you from just changing the oil yourself in yo

Why on Earth would an oil change cost $2000, or even $400? Are these stealership prices or something? What keeps you from just changing the oil yourself in your garage? Surely a Lamborghini uses some standard oil like 5W-30 and some standard filter; it's not like they make their own oil and filters. And why would plugs cost $4000? Again, they surely don't make their own spark plugs, but instead get them from a vendor like NGK or Bosch, and are probably the exact same plugs used in various BMWs or something, which you can buy anywhere. Specialty parts, made specifically for that model (or for Lamborghinis in general), are of course going to be expensive because of limited supply, but the oil change thing really doesn't make sense, that just sounds like price-gouging.