I'd like to add that our subjective appreciation of the music is linear. The cost is exponential.
Let's say, for example, the best speaker "bang for the buck" is $300/pr. A clear audible upgrade may cost twice that. Then, twice that. Then twice that. Until we reach the stratosphere. You'll also find that lower price points are "all business" where the lion's share of the investment is in sound quality. As we move up the ladder, elements of esthetics, build quality (yes, does have an effect on sound quality, but not linear) come into play. Those factors may be very important to the owner who's willing (and able) to invest in them. Money well spent.
Obtaining quality and/or quantity is not expensive if you target one, or the other. Getting both simultaneously gets pricey in a hurry, but also represents the best-of-best in world-class gear.
Back when I was a dealer, our "reference" 2-channel system topped out at $80k retail. It's nice to see this aligns with the "take this exit" price point with many of you.