Second of all, I'm sure most of you might agree that if there's one good thing of buying "snake oil" cables it that they look pretty. Sure, a person could be considered shallow for buying cables for their looks but, on the other hand, why should I use some lame-looking cable in my room that I have decorated -- just to save some money.
I so agree that expensive cables are quite often snake oil but come on: I think it's so ridiculous and downright insane to say that expensive cables are no better performance-wise that these no-brand-cables. Honestly, do you think that the cable makers, the cable reviewers and the consumers, who buy these cables, are in a conspiracy to make us hifists cough up extra dough for nothing. I find this attidude really weird.
To sum it up, I'm sure that expensive offer no big difference in performance when compared to cheap cables, but they do offer some difference. If this was not true, then I guess hundreds of thousands of people who have bought these more expensive cables are just idiots, right?