I guess it is important to remember that in many circles the difference is not disputed at all. In fact, it is primarily disputed in circles amongst which people have generally not tried any of them. There are plenty of people who think that high end speaker cable is highly overrated (or no better)... Then again there are also many people who believe that the $180 a foot Kimber Cable makes an incredible difference.
Maybe we should keep in mind that there is no $3000 cable that I am referring to... but more like a 12 foot power cable that lists at $850 and not $3000. I do realize that this is still very expensive, but there is a HUGE difference between a sellign price of $3000 and a list price of $850.