Interesting comment, and I have to agree, although more carefully than you stated it
I'm taking it you've had your fair share of experience with external setups yourself? I agree with the statement that sometimes audio quality and price of product above a certain price floor have a lowly (positive) correlated relationship, but I am going to disagree strongly with the fact that it all sounds virtually the same. Maybe you don't actually feel this way and you just weren't being careful with your words (NOT meant to bash you here, just curious). With external loudspeakers, just like headphones, you're going to find different flavors. Switching between specific Martin Logan, Klipsch, Canton, DefTech, Mirage, etc (this list could go on forever) I still find changes in presentation, and pretty significant ones at times. If you have the opportunity to get yourself in a sound room with a lot of high end loudspeakers and can quickly switch between them with a central unit (you can find these at some "hi'fi" stores sometimes), I feel like you'll swallow your words a bit, or at least modify them. I agree that you can't make the blanket statement "I paid more so it much be better", but I think it is okay to say that paying different amounts of money can lead to different types of sonic presentation, and if that preferred presentation is more or less money AND you're willing to shell out whatever it costs to get that right sound, I can't be one to say someone spent too much money on it even if I may not agree that it is the "best" sonic presentation available.
Again, no disrespect.