I would bet that we all have bought things that we don't really need. Impractical stuff, but hunks of wood that improve sound? Special fuses, power cords, etc, that cost hundreds of dollars, or more and have no sane theory about how they work, or even how they possibly could work at all, let alone any better than a "normal" fuse or power cord, interconnect, etc. It amazes me that people think putting wood chips on their amp could do anything but possibly smell a little if it got warm enough.
I admit it, I'm a kookwatcher, and this stuff is firmly into the kook range of things, along with shapeshifting lizard men, chemtrails, etc. I love reading and watching videos about them all.
This has been one of my favorites: