I LOVE to make fun of audiophiles as much as the next guy
We like to say around here " If pedophiles molest children what do you think audiophiles do to audio "
I can hear the thought police and word nazis groaning already but whatever.
These right here are kind of bad examples.
IIRC Johnson was able to pick those different batteries in a PCABX test (
http://www.pcavtech.com/test_data/ )
They werent different brands of batteries but different technologies, which could make a humoungous difference if the pedal in question is an effect containing a Low Frequency Oscillator such as a flanger or chorus.
Hand wired amps are pretty much a guarantee you wont end up with chinese crap in your amp of someone stamping out a PC board and then sticking a tube in it just to make it glow. I dont believe that handwired point to point is necessarily better than a WELL MADE PC board, but there are lots of ways to wire the exact same circuit, layout the components too close together and really screw things up. This also is easy to test.
Oddly coated strings? Well if theyre Elixirs for instance, they resist corrosion and keep their new tone for a lot longer...Similar processes are used in many technologies, such as plastic wrap around twinkies or galvanizing nails
Custom wound pickups are an extravagance but they make perfect sense...They change the electrical characteristics of the device. This is easily testable.
Its not like the guy is telling us to buy shakti stones, or these stupid 1500 dollar power cables that are suckering some of my fellow engineers.