Was it Julie Mullins from one of the legacy mags that recently described the trend of manufacturers targeting the "ultra" high-end? I know I commented on it, and thought it was here (though I'm not a regular reader of the magazines anymore).
In the early '70s, when I got serious about this hobby, everybody had a stereo system. It might not have been a great one, but usually TT/Receiver/bookshelf type speakers.
Today, hi-fi is not just a niche pursuit, but a luxe goods product. Which allows a lot of room for profit- from the importer/distributor to the dealer and on to the consumer. The market will bear these costs to a degree but the enthusiast market, in my estimation, was never about how big the check was- it was the pursuit of building something excellent (whatever that means to you) over time--many of us gradually upgraded to get where we are after various systems that were probably more than "OK" to the average consumer.
Part of it is simply consumer culture. An Hermes store opened on South Congress near me. For old Austinites (I don't include myself in that category), it is emblematic of the "new Austin."
A lot of the people I know who have long been deep in this hobby are not in the billionaire class- they are just ardent hobbyists who don't spend on boats, Ferraris, second or third homes, jet shares or whatever. (I read a funny thing recently that said that X was a product for people who ran out of things to spend money on). For some reason, I don't think hi-fi is even on that list for most people.
In short, we are nuts about this stuff- hi-fi bugs (I think I did keep the LP with that title and the art is photos of insects).
Respectfully,