@daveyf
Other than the pricing of some of the gear I don't see a lot of parallels between HEA and luxury vehicles.
Many people buy expensive vehicles to present a certain level of success to the world, to outdo their neighbors or coworkers, etc. That dynamic isn't really in play with audio systems as far fewer people are going to see your audio system than your car, and even those people you invite inside likely aren't going to know Bose from Magico.
Also the maintenance issue doesn't really apply to HEA. Outside of tubes in tube amps and styluses in cartridges there's not a lot of routine maintenance needed in audio systems. Amps and speakers can go decades without having to have caps replaced, and even if they do need it the parts themselves are generally inexpensive.