It would seem that one of the things being overlooked is time. These mega-buck items, whether it be cars, stereo, watches, machines, etc take a huge amount of man-hours to custom build. That costs money, any lots of it. Often it's short-term borrowed money that must be repaid upon sale, with the interest. That has to be figured into the cost. Overhead, such as CNC Machining centers ARE NOT cheap. A 5-axis could get into 6 figures. Time on one isn't cheap to rent. Programming can be the Achilles heel and if you can't write your own, programmers like to be well paid.
My point is that mega-buck "?????" likely cost big bucks to build. The folks that do this work are talented craftsman, sometimes extraordinarily so, being given a job. And if it happens to be here in the US, all the better.
I represent a very small English CNC machine builder. All of our machines are single purpose, custom built, one off units designed for a specific purpose. They are not cheap and lead times can run 12 months or more. I've watched a fitter hand scrap one square foot of cast iron for days to get it perfect. Not just good, or OK, or that'll do. Perfect as in laser auto-collomated perfect to within a couple of microns.
And he's just one of an entire team tasked to build the machine.
The profit margin is , I doubt, what you think it is. Most people are surprised when they find out.
My point is this; You can throw all the money you want at anything you can think of and someone will come along to satisfy your needs. If you want custom, it's gonna cost. How custom depends on how much you got to throw. Does it make it better??? In some ways, yes. Certainly in build quality a huge improvement is to be expected. Performance?? No real answer there, at least in my view. What is an amazing revelation to you may out me to sleep. Your Ulysse Nardin keeps time just like my Timex does. Is yours nicer? Yes. Better? Not to me. Hell, my Timex may even keep better time. Would I own a Ulysse if I could afford it? Oh YEAH! Am I sad because I don't/can't? Not in the least. I am happy with what I have. And that in itself brings me joy. My wife has spent the better part of her life teaching me that one lesson.
And if I had the funds, I would sit down with an engineering team in my house and develop a sound that suits ME and have everything custom built to that end, from the first input jack to the last soundwave would be tailor-made for ME.
And please accept my apologies if ANY of this is taken in the negative. It's not meant to be. Be happy with what you have, and be happy for others for what they can have.