All you have to do is look at the crazy adverts in many "hifi" magazines.
There are many places selling such as cables with ludicrous advertising claims that imply they are somehow "better" and with eg. 50x higher price than a generic cable that will function exactly the same.
The most ludicrous ones are digital interconnects such as optical leads or HDMI, which imply some magical and totally impossible improvement.
With audio gear in general, there are many high
end price makers that do not publish actual technical specs, basically pushing things on trivia such as case materials, exotic sounding names or just "it's good because we say it is" typo blurb.
That's the "Snake oil" - and the magazines have to go with it, even publishing laughably impossible reviews, as they only survive because of advertisers - and a legitimate review of one of the scam products will mean they lose their income.
Some audiophile gear makers do publish specs with ludicrous price gear, which can be good for a laugh:-
Example - go to the "specs" link on this, at almost £2500:
Buy your Schiit Yggdrasil online, directly from Schiit Europe, The Authorised EU retailer offering 5 years warranty
www.schiit.co.uk
Compared to the audio outputs on such as this far more versatile device, at roughly £100 (I got one for £20 secondhand).
The original studio-quality 2-in, 2-out interface, Focusrite Scarlett 2i2, has been remastered for the artist.
focusrite.com
And of course the most telling point is that major recording studios do not use "audiophile" type gear, they use what is actually good - and usually quite cheap in comparison.
