I wonder if this is the audiophile equivalent of computer enthusiasm.
I mean, like audiophiles buying gold cables for 10x the price and no reason, and using 20's tech (vacuum tubes) in their amps, selecting individual tubes and all that...
So here the keyboard enthusiasts select their switches, key curvatures, materials, etc. and the result might just be some placebo feel good improvement and more noise for everyone else.
I have used a mass-manufactured red (linear quiet) keyboard, a custom split blue (tactile loud/clicky) mechanical keyboards, the keyboard on my current XPS 15, and many years ago a MSI gaming laptop with a SteelSeries-made rubber dome keyboard. I realize these are audiophile terms, but there is a huge difference in how each keyboard feels and how satisfying it is to type on them. It's not just like having slightly 'cripser' etc. audio - the differences are extremely obvious.
The red keyboard sucks for typing; I didn't realize how much until I switched to the blue. They offer no feedback and my WPM and error rate is much higher/lower on the reds. The blues have very solid feedback and feel nice to type on, the sound is also beautiful. The keyboard on the XPS 15 sucks, it's like typing on a piece of styrofoam - but better still than the new MacBook keybaords, which feel like like typing on a piece of wood. The MSI laptop had a very deep keyboard (almost as much key travel as a mechanical one) and the keys were heavy. The pressure required to push them down felt nice, and they bottomed out in a very satisfying way. I only use the MSI laptop a few times a year but I always look forward to typing on it.
If you only drove 4 door sedans (normal rubber domes) you would think that people are crazy for wanting to get their own customized cars in different form factors, but if you drove a sedan and a SUV and a pickup truck and a motorcycle you would know that it's very much not just a 'placebo feel good' difference.
On the other hand if you go to /r/mechanicalkeyboards you'll find weirdos spending $200 on keycaps and cases and $50 on USB cables, or people that collect dozens of keyboards, or people that use 10x3 keyboards (letters + space, no numbers ctrl alt etc.). Those people are the audiophile-type ones. I just have a nice $120 keyboard which I love to use and which will last a decade or more.
You can find audiophile-type stuff for really every category of purchaseable products. I have a beautiful metal $15 fountain pen (Pilot Metropolitan); on /r/fountainpens you'll find weirdos spending $100 on an ugly octagonal pen made with transparent plastic. Here's a video on laundry machine collectors who bring dirty clothes to meets and listen/watch to the laundry machines go: https://www.youtube.com/watch?v=jmmmxI-Y_6U
Also, to some people the sound is really pleasing. You may want to try out Bucklespring, which plays the sounds of an old IBM buckling-spring keyboard through your computer speakers, and you might realize why so many people like clicky keyboards. When I'm not using headphones I can hear the blues, when I am wearing headphones the blue switches are muffled and their sound mixes with the sound of Bucklespring. When I take the laptop outside and I'm alone I turn up the speakers a bit; the buckling spring keyboard on its own sounds amazingly good, and helps reduce the type-on-wood feeling of laptop keyboards.