Think you may have hit the proverbial nail on the head there - some punters will buy just because the figures tell them it's better. 100w/channel vs. 200w per channel total music output etc. The higher the number, the greater it must be....they forget other factors can have an influence.
Some people will never make up their own mind which to a great degree, is where this all takes us. Does the OP think another cable is making a difference? If so, buy it. If not - don't.
Some won't make that decision and will accept data as the absolute answer. Even if a cable could be shown to make the picture/sound better, doesn't mean everyone will see or hear it. To the one that doesn't it's a myth and they'll argue until they're blue in the face (or banned from the site!) that everyone else is wrong.
I didn't like 100hz TV pictures as to me it looked blurry. Others swear by it. Each to their own.
The proof is in the pudding - taste it, if you enjoy it, eat it. If you don't, then spit it out but don't spend forever trying to prove to others it's horrid.