Speaker Cables? why all the hype for expensive speaker wire?

if there were actual differences, there would be published data that outline physiologically-detectable differences in all the ads.

I haven't seen any of that.

I have used 14g two conductor low voltage (for outside lights) copper wire from Lowes and Home Depot  for the last 20 years and have never even thought of upgrading speaker cables. The only changes ever made had been to compensate for length for speaker movement in different rooms and homes.After reading these discussion columns for the last several years, I began to wonder if, 1. more expensive speaker cables can improve my sound, and 2. if more expensive interconnects (than the flimsy red/white freebie type cables) can improve my sound.My very limited experience has been that the more elaborate and expensive speaker cable did nothing that was audible to me, altho' the banana plug "pigtail" that I had made facilitated switching between systems on my pair of speakers.However the interconnects, at first try, practically eliminated/veiled the higher frequencies.  The second try was the opposite, in  that they were extremely bright.  So I went back to the bag full of cheap interconnects that I have accumulated and again am quite happy with my sound.My conclusion is that what your ears tell you is the truth that you want to listen to.In my narrow mind, anyone that pays 3,000 never mind 30,000 for a piece of wire needs therapy.  Much like the difference between a Camry and a Corvette, both do the same thing i.e., move you from one place to another.But OMG, doesn't it make you "feel" better in the Corvette?

So out of the several hundred choices out there you tried a couple of the cheapest worst ones, they were as we all know highly variable in results, and from this meager random sample you have concluded you not only know more than much more experienced listeners, you know enough to conclude they need therapy. Impressive. 

If someone only tries low-grade low-cost cables and never compares them hands on to really good cables (in a high end system with great upstream components) you likely will never know what you are missing. Kinda like buying a really nice sports touring car and only driving it in your local neighborhood.

What’s the saying..."if i have to explain it you wouldn’t understand".

i agree with @decooney

but really good cables do not have to be extremely expensive cables

let’s not conflate the two

expensive cables also aren’t always really good cables, in an absolute sense, or applied to your system

the only thing you do know about really expensive cables is that they are really expensive