This is just my opinion, but I think that right there is the most rational reason for getting the stuff.
I've heard distinct differences in cheaper cables that I compared. Blind? Nope. They were both the same price (free or nearly free) so I really don't know what would have swayed me. I'm also not saying it was magic- the common parameters of cables differences certainly could explain it. I can't say I heard differences in the expensive cables, because I never made the comparison. I'm not saying they aren't there, I just never listened to my expensive cables and my cheap cables back to back. I'm currently running decent but cheaper cable because my fancy ones are too short (and ugly- they look like garden hoses), and don't match my carpet. I had bigger fish to fry- I wanted my living room back from the stereo monster. But I'm still open to the idea that the more involved ones from Audioquest sounded better. I may make that comparison later today. Or I may just sit on my butt and listen to tunes.