There's a lot of spergery and snake oil in audiophile circles, sure, but the other end of the scale and saying there's no difference in quality between cheap headphones and more expensive ones is also bogus. It's a lot like video quality, actually. You get diminishing returns the "further up" you get. 720p looks noticeably better than 480p, 1080p looks a little bit better than 720p, 4K looks barely better than 1080p. A lot of people who obsess over sound and picture quality could save themselves a lot of money if they weren't concerned over improvements that are barely perceptible to the human senses.