Why do better MC cartridges cost a fortune?

A new Bugatti is not a real Bugatti. :)
Yeah, i’m sure there are some less outrageously priced cartridges that can deliver top tier performance. I had Lyras for a while (the Parnassus with the fancy magnets and a Titan i when it first came out). I gather that the stone bodied Koestu is more neutral than the wood bodied one.
Horses for courses. I like what the Airtight Supreme does- just hate paying the tariff. Fair point that one shouldn’t have to spend 10k dollars to get state of the art. There’s certainly a lot out there- Dynavectors, Benz (though not really available in the states I gather or certain models aren't but correct me if wrong), a whole raft of others- Soundsmith, etc.
As mentioned, I’m planning to experiment with some less costly cartridges once I finish the SP-10 set up in my vintage system.
I know David Karmeli- who posts here (I think) is very fond of a certain era vintage Ortofon SPU. I don’t know if he messes around with retips or simply finds old cartridges that still have life.

willemj

And yet, none of them are as neutral and reproduce the original as cleanly, with as little distortion, and with as much channel separation as a cd/dvd/bd disc player of a few hundred dollars at most. As I said, such cartridges are the emperor’s new clothes.

If you want to play LPs - and there are many fine LPs that have never made it to CD, or whose original LP sounds better than a CD made from its aged master tape - you’ll need a turntable. A cd/dvd/bd disc player won’t suffice.

You seem to be confused about the fable of the emperor’s new clothes. In the tale, the clothes do not exist. On the other hand, expensive phono cartridges do exist, and they play music. Perhaps that is of no value to you, which is fine. But your analogy shows an ignorance of phono cartridges, or the meaning of the emperor’s tale, or both.

There is the pretense that there is something (audio quality) which there is not. The analogy is with the listeners/onlookers who sheepishly follow the flock.
Of course there are recordings that are not on cd and only on lp. I still have my turntable for those, but I find I rarely if ever use it. The reality is that streaming services now offer such a wide selection that no private music collection could ever compete. I have a busy job, but if I had time I would digitize all my lp's and just get over with it.

These are for the rich only!

The rich audio buffs are usually not scientists or engineers, and lack basic technology understanding, to "fine tune" the turntable/arm/ cartridge setup. Their systems rarely have optimal sound quality. They "throw money away" and believe high cost = best.

They go for "snob appeal" to impress other rich friends.

Proper arm/cartridge setup with expensive $1K to $3K, (but not ridiculous) cartridges is all you need for SOTA sound!

There is no rational justification for spending $10K to $15K on a cartridge IMO.

YES I have heard the big buck cartridges FYI.

The problem with old cartridges is that their suspensions may have dried out.