First you stated, "Not all recording studios use inexpensive commodity cables. More and more are moving towards using better cables. In fact, I currently have a recording studio demo'ing some cables". Then you stated, " "Vintage Western Electric wire is often far superior to modern copper wire. It makes especially good speaker and power cables."Vintage Western Electric wire is often far superior to modern copper wire. It makes especially good speaker and power cables. Certified Audiophile Grade, assuming good design and connectors for sure. So I disagree with your characterization of the cables used in that time period as "chedapo", but it's true they were not "voiced" to sound a certain way, or cost more than they believed was necessary. The recording process is of course lossy to some degree, but good cables can minimize losses and thus enable superior reproduction of the recording on a capable system.
There's no doubt you can get decent cables at any price point. As you spend more, everything else being equal, you increase resolution and decrease coloration. The laws of diminishing returns apply just as much as anything else, for example a Porsche GT3 RS at $300k isn't 10x as fast as a Mazda Miata, and it's easy to argue a Miata is the worlds best sports car, yet for some reason, some people go for the GT3 RS. Personally, I think it's snake oil. The GT3 isn't faster, it's just propaganda. They both burn gas and have tires!
So if vintage WE wire is so good, why is it not currently used in studios and including by you? In the 50s you'd be lucky if it was even balanced.
WRT laws of diminishing returns and your Mazda versus GT3 RS analogy, you're stating the 150HP Mazda can be argued to be the world's best sports car and the GT3 RS is snake oil with 500HP and 0 to 60 in under 3 seconds, I'll have some of what you're having. Also, and while it's true the law of diminishing returns applies to audio gear and cars, the reason the Porsche is $250K versus the 30K Miata is not only specs, it's features, status, handling, comfort, and most of all the overall experience.