@dazo
I got some fancy power cables at wholesale from a friend who worked in an audiophile shop. A few years later I sold them for a profit. They came with zip-up hard cases (disc shaped, for coiling).
On a single-blind test in a recording studio, I actually could (just barely) tell a minute difference. Not a night and day thing, just a "If you force me to pick, I prefer sound A to sound B" thing.
(Pro Tools confirmed that this difference was real.) I doubt anyone outside the studio, who wasn't an experienced professional and not listening to calibrated monitors in a treated recording studio, at 24/96, could hear it.)
What really gets me is people who think they can hear the difference between hard disks and ethernet cables. (Unless you have shitty jittery DACs, this is provably impossible.)