One sad truth is that many "audiophiles" lack either the faculty, or training, or both, to discern those heightened sonic attributes for which they so often pay so dearly. It would not surprise me if less than twenty percent of you reading this, now, can hear well enough to discern what those "golden-eared" ones can.
Furthermore, I suspect that very few of the "golden eared" have honed their listening abilities sufficiently to make effective use of what effectively remain naught but latent abilities.
Following your argument, pretty much everybody has no idea what they're hearing, and therefore have no basis to judge if it's truly good or not.
3) I suspect that, ofttimes, the developer of an expensive tweak
a) Doesn't, really, know why it works, so they posit something that may be absurd, or, at best have little to do with anything
And since audio equipment, like tweaks, are created by the same types of people, they must not know what they're doing either. Which makes this whole hobby a joke on itself and its participants.
Can you not apply this argument to most things man made created for fellow man to enjoy? if i buy an expensive sports car and I like going fast, in reality, the expensive sports car is a mass of metal only thought to perform well, but its creator doesn't really know what he's doing and if or why it works. And I only think I'm going fast, in reality I'm not smart enough to know what fast is, and I'm actually probably not going fast at all.
So we have no idea why we like something, and moreover, we're idiots if we think we do. Makes sense, since we're all living in the Matrix anyway.