What’s your vote for the most ridiculous, overpriced, and useless tweak?

My vote: Furutech Outlet Cover 105 NCF $220, with “special crystalline material that has two “active” properties.” https://www.thecableco.com/outlet-cover-105-ncf.html

fsonicsmith sez ...

"1) anything from Perfect Path Technologies"

I guess at this point we can assume then, that you have contacted PPT and accepted their offer for a 90 day, money-back, no obligation trial on their products, have given them a fair trial, and then found them to be unacceptable to you, correct? So, please enlighten us ... which products did you try that you found to be ineffective in your system?

I’ll wait.

Thanks ...

If you look at the first comment to the OP, it makes the very same point as yours. So here we are, 144 comments later, back to where we started.
Full circle, full stop.
cryogenically treating speaker cables. Back in around late '80's or early '90's cryoing rifle barrels was all the rage. Had one cryoed and it was 100 bucks pissed away. In spite of anecdotal evidence there is no proof that it does anything.
I cryo my rabbits before I smoke them. They are way better cryo'ed than not cryo'ed.
^^^ I tried smoking rabbits as a teenager. I found them hard to keep lit.