I think it gets even worse: by putting your name beside this kind of miraculous-until-proven-otherwise gadgets you are lowering the standard of your endorsements and probably hurting the image of other companies involved in true, actual research.
+1, this was exactly my point about trying to keep the MI market as honest and transparent as humanly possible. Not understanding nearly as much about electronics as I would like, I sometimes have to rely on word of mouth when choosing what to try out next. Experience is good, but you can't always gig an amp for three years before deciding to buy it.
It is my humble opinion that talented artists should outgrow the "IT'S ALL ABOUT ART NOT COLD SCIENCE!!111" attitude and use a sensible approach when talking about things not made by musicians.
You are right, but only to an extent. Remember that once whatever product is made, sold and used, any difference in tone that it actually has will be judged subjectively. The tiny (perhaps negligible but at least real) differences from things such as instrument cables or tonewoods will not necessarily improve your tone, that is a matter of personal taste and not of whether you can measure the difference.
Being a talented artist doesn't have a lot to do with the rationalization of electrical equipment. It is my suspicion that the ESP endorsers never even doubted that the power cord made a difference, and probably never will unless it is brought to their attention that it doesn't.
The result was out of 15 test participants, overall they identified the correct cable 49% of the time or in other words around the same statistical significance of flipping a coin.