Dangerous analogy territory here. Perhaps people don't buy Wadia because it sounds better than Arcam?

The 'double blind test' is an abstract expression of the scientific method. There's no formal type of test, just a set of requirements that have shown themselves to be necessary for the result to be meaningful.

There are many people (clearly including some here) who believe that the 'scientific method' is the peer of healing with crystals. There's no arguing with such.

It would be nice to see two amplifiers that measure the same, and are both operated within their limits, being proven to sound different. But it hasn't been done. Let alone two cables that measure roughly similarly. Or in directionality. Or even more obscurely running in.

But if paying attention to cable directionality, or paying £7000 for a CDP improves your listening experience then that is surely all that matters from the individual's pov.

OTOH people selling snake oil at huge margins should be run out of town.

Paul