People will spend money on a mouse that feels better in their hands. People will spend money on a keyboard that feels better to type on. People will spend money on a monitor that shows more pixels, faster and more accurate. Those are sensorial feelings that people put value in.
I own two Herman Miller Embody chairs, an Aeron, and a Celle. Why do I own these? They are obscene in price, right? Not really. I used to go to Office Depot/Max/Staples and buy the $150 to $300 chair. I'd replace the chair every two to three years. Why? Because it would break. The chair became disposable. The Aeron chair that I own is nearly 20 years old. In those 20 years, I have spent $75 buying a part for it that was out of warranty. The Celle chair? That was sort of free. I had a chair that I purchased in 2005. I forget the model. I paid about $500 for it. In 2015, the back which slid up and down would no longer stay in the up position. I took it to the dealer. The dealer called the next day and said, "Come in and choose a new chair. It's free." Herman Miller decided it was cheaper/better to give me a new chair than it was to repair that old chair, and oh by the way, I could keep the old chair as well. So for $500, I got a chair that is covered until 2027 for anything wrong with it. 22 years of a chair for $500 is much less than the $300 every 2 to 3 years at Office Depot. That Aeron bought in 2000 for $600 has worked out to just a little more than $30 a year for that chair. You can't say the same about the Office Depot chairs.
The other thing that you are missing is the amount of time that someone spends in that chair. I know that I spend nearly 8-12 hours per day in my chair. For that, I want comfort. For that, I am willing to pay to have something that fits me and doesn't cause me to look up the number for the chiropractor.
So yes, I will continue to buy Herman Miller products until I die. I may not buy something every year or so, but when I am in need of some furniture, it is worth it.
I do wish that the Logitech versions were out before I bought mine though!