There are many, many people out there who have never turned their minds to the idea of "high-end cables" one way or the other. Those people decide to buy a nice sound system, walk into a high-end shop, and the salesperson talks their ears off about how they need to drop $1,000 on interconnects or their $3,000 system is worthless. On its face, of course, it makes sense - you need to make sure the things that're carrying the signal between the source, the amp, and the speakers are up to the task! What the salesperson isn't telling them (or doesn't know) is that "up to the task" is, in 99% of scenarios, whatever cheap cable came in the box with the damn thing.
So it's a service to those people to continue to repeat, and to demonstrate with sound evidence, that this is a bunch of bullshit intended to separate fools from their money.