You state you've never seen snobbery, but have experienced it from the "non-upper" crust players.
We both know it exists on both sides of the fence (show up at Lime Rock on Porsche day with your MR2 that you can drive well enough to run circles around the Porsche drivers. You'll experience plenty.
A scientific cable test would actually be fairly easy with the proper equipment:
Measure signal going into cable, measure signal coming out of cable, measure signal produced by speaker in anechoic chamber.
Compare every aspect of that signal at all points.
If the signal produced by the speaker is identical (or not), then the sound produced will be identical (or not).
'No need even for human testing (unless two completely
identical signals/waveforms, etc. produced can still sound different somehow, since two
differing signals/waveforms, etc. can certainly sound different)!