Yup, there is a lot of snake oil in the audiophile world. The worst instance I saw was someone posting about an intermittent buzz in their system. Multiple people were recommending a full rebuild, (which would cost thousands of dollars). From what they described, it was pretty obvious that OP just needed a ~10¢ ferrite bead on a power cable, to make it stop acting as an antenna.

I was like “okay, you could try rebuilding your entire system like everyone else is suggesting… But maybe start with a ferrite bead. Here is a link for a multipack on Amazon. Worst case scenario, you’re only out like $5. And even if it doesn’t fix this specific case, the multipack is handy to have around anyways, because manufacturers often cheap out and skip adding them when their devices really do need them.” Like three days later, I got a “holy shit this actually worked. You just saved me thousands of dollars (and a ton of time) on a complete rebuild.”