Just my little 2p on rip off and fools with cameras and hifi's and too much money.
Years ago I spent my days staring at faulty kit and oscilloscopes and unless you've looked at electronic circuits in this way you'd probably not believe the effect that a piece of wire or even the shape of a track or its routing can have on a signal. You have to start at the beginning and the very best switch mode power supplies are big heavy beasts but the best of the best do their job and they do it well but the vast majority of devices in peoples homes don't have these big beasts they have crappy little psu's and sometimes rank bad design from the psu and on up. For example I used to do some work for a company which made components for several high end hifi manufacturers and some of the designs were almost laughable, and were talking about expensive high end kit here. If you want a pure unmangled feed on through you have to start at the beginning and continue that philosophy through the whole device and on to the next and yes that may as well start at the mains plug. Don't believe it? Go and scope it and see
There is of course the question of if a human can hear the differences
but us with cameras have similar debates but instead of hearing seemingly impossible differences we see them.
My point is that these almost laughable things can make a difference and even though it may not be a real world difference I'm not really in favour of ridiculing it. Best just to leave it to those with obsessive interest and deep pockets.
