When I first started out in this hobby, I was sure all cables sounded alike and cable marketing was all a scam. As my ears got better, I could hear the difference and realized it was important to me, so I bought into pricey cables.
And I have never heard two pairs of speakers sound the same -- there's always a difference.
My impression is that cheapaudioman 1) cannot tell the difference in sound at the high end which is convenient because 2) he doesn't have enough money.
He notes the diminishing returns with higher price. At some price level, he can't tell the difference (or the difference is too small for him to care). But there are others who hear the difference and do care about it. When listeners can tell the difference between $60k speakers vs $10k and have the funds, the value proposition makes sense. That's the market niche.
So with sour grapes, he labels the high end a scam. May his ears never become educated to appreciate the finer differences in those diminishing returns.