@waytoomuchstuff I agree with what you're saying but I think there are actual qualitative steps in manufacturing quality across many sectors including audio components and speakers, but the ceiling price point where diminishing return sets in, in my experience, is probably the upper-end of the mid-range components available these days. After that, you're entering the luxury end where people (IMO) are paying to display the item more so than having the expectation of a huge jump in performance.
For example, my vintage Craftsman tools are of better quality than the new Lowe's Craftsman tools purchased for about the same price (adjusted for inflation) but only because I think they are. My Wera sockets and torque wrenches are better quality than the comparable Park Tools and the price point shows it but only because I know what to look for quality wise. If I hand a hex wrench made by Wera or Husky to my wife so she can tighten a 5mm bolt on some cabinet she wouldn't care to know which one was "better" as either one gets the job done.
I know when I spend my money on certain things I focus on getting the best quality for my $ knowing I have a ceiling to that quality for the $.