This is the same discussion you can have with any hobby or any retail goods, and comes up on audio forums every 6 months. But with audio, there's a lot more indignation.
As far as value, you can do worse than the highest-end audio. Look at fashion, 5-6 figure handbags and dresses, totally normal and nobody laments about how dress prices are ridiculous or that Hermes just raised the price of their bags again. Or $1000 perfumes made up of $5 worth of synthetic chemicals, the packaging often costs more than the product.
With cars, nobody looks at hypercars like La Ferrari, Porsche Carrera GT, Konigsegg or McLaren Sennas and the first thing out of their mouth is their own modded Corvette will beat it around a track and the owners are crazy for not just buying a Corvette. Everyone would look at you like #1. You're naive and have a childlike view of the subject, #2. You're just jealous. Few people I know in the car world, either racing or show cars, would respect the opinions of a person after they make a remark like that.
The highest end audio systems are cheap compared to expensive hobbies like racing cars and yachts. For some, buying a top-end audio system just isn't a ton of money.
The world is made better by creativity unencumbered by cost constraints for many reasons. This applies to art, architecture, vehicle and aircraft design, and certainly audio systems. We all benefit from seeing or experiencing cost-no-object design, and we all benefit from the lessons learned from such endeavors. Few can afford to buy and race a F1 car, but it's still fun to watch F1 racing and a lot of tech from F1 has made it's way into cars we actually own.
I have no idea why people can't appreciate high end audio in the same way, without feeling such negativity. I often hear about it being "fake luxury" but that also applies to everything else too. The Cadillac Blackwing CT5V for $125k rides on the same chassis as a $25k base Camaro, it just has a larger engine and fancier interior trim. That $20k dress is just fabric sewn together like any other garment. I think some consider the folks who buy these products idiots who are being ripped off and simply don't know any better, but imo that's coming from a place of naivety and sour grapes.
People can make their own choices, there are options. I often sell my cables to people who can afford anything they like, but would rather have something that works well without the dealer-sale luxury goods experience. Others may go all-out and spend $250k on top-end Siltech. Both options are available and folks are free to choose how they want to spend their money. For a lot of people that difference between spending $250k vs $25k just isn't a big deal. The dealer will bring it all to their house and offer setup and and other services I simply can't offer. Despite the fact I make a living on offering the high-value non-luxury route I don't judge the folks who buy top-end dealer-sale brands either. It's all good.