Just as a note, Dave Clark is hardly a "hot shot" that "auditions and takes measurements for a living.."
Dave is just like the rest of us, but for his passions may run a bit hotter for things audio then most of ours do. He is a school teacher by day and a genuine all around good guy. I think to say he makes his living at reviewing is a gross overstatement.
This is relevant as to the arguments that reviewers won't put their reputation on the line for a million. I think most would. Most reviewers are guys/gals who do if for the fun of it. For a million bucks I would think most would abandon their "reviewing career" at the chance for the cool mil.
I get paid $50 per review and I currently review about 2 or 3 products over the year (Thank God I have a license to practice law to fall back on). Yes, I can hear the differences between cables. But, the ONLY way I can hear that change is in MY own system that I have listened to for hours upon hours and know every intimate detail of how it produces music. I know these details of my systems sound and therefore, I know when something has changed.
That is how I review most of the mort subtle products such as cables. Honestly, it takes me several listen sessions to fully flesh out the difference and nuances of a new cable. Unlike speakers or amps where these changes are almost immediately apparent. I suspect that there are others, reviewers and otherwise, that can "hear" the most subtle difference loud, clear and immediately. It is different for everyone...
As I usually respond to the one that claims there "is" no difference between cables because they could not hear it
.the only thing such a person has proved is, "they" cannot hear such a difference and not that a difference does not exist.
Just some thoughts of marginal relevance, John