What’s your vote for the most ridiculous, overpriced, and useless tweak?

Latick,
You were the one seeming to ask for spec from the OP and so my comment about specs in these product lines in general.  Does the manufacturer even provide and about their own [product? 

By your logic if someone advertises that placing their specially formulated dog poop under  screen the picture improves I have to try it to call it nonsense?

BTW I return to my argument that you can say your hear something and without double blind tests how can it be anything but suggestive testimonial evidence?  

Of course not all tweaks are nonsense, and my education is in computer, not electrical engineering, but the power of suggestion and wishful thinking certainly plays a part no matter what you think of my "credibility."

>>>>>> I suppose you tried this outlet cover and found to be completely useless.....do you have any measurements to substantiate your vote? What receptacle did you pair this cover with? <<<<<<

I laughed when I read this.  Given the so-called high end audio business seldom uses specs at all, especially with these types of products, what specification would show what effect that a power chord, plate cover, green ink etc etc has on sound?

That is the magic dust that some people selling products depend on.  I/we have no way to experience or validate, beyond possibly double blind test, which the hard core disdain) if or what differences you/we say we hear.

 I am not denigrating ANYONE's experiences but do think some are self fulfilling prophesies and bias.  How a very very slight diminishment in some vibration can change specific timbre, sound staging etc in electronic devices..lets just say I am skeptical but kudos to Navy and USAF because their stuff seems to work fine on ships and aircraft  lol