Nice post, BR! You are clearly correct that speaker cable cannot add to the signal (unless it'[s picking up signals extraneous to the source signal). I also agree that barometric pressure and other environmental factors probably contribute more to the SQ (or detract from it) than interconnects or speaker wire. I also think that spending a lot of money on cable is unnecessary.
All that having been said, I really like the Mapleshade wires and ICs. JMO. Of course, I also like Axiom speakers (terrific value for the money) and the Sonic Impact T-Amp (outrageous value for the money) tube amps, persimmon woods, Titleist tour blades, balata 90 compression balls (if you can find any anymore) and manual transmissions (hence the user name).