why do people feel the need to buy expensive cable


I have tried expensive cables and one's moderately priced. I would say there were some differences but I can't actually say the expensive cables were better. IMHO I believe a lot of people buy expensive cables because they don't actual trust their ears and are afraid of making a mistake. They figure the expensive cables are better for the fact they cost more. If you have a difference of opinion or share the same thoughts, I would like to hear about it.
taters
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I bought my reference MIT cables based on home audition in my system. I just didn’t want to be without them as the detail, nuance and dynamics were all incredibly improved for my Spectral gear. It was a no brainer. Costly but a very enjoyable improvement in everyday living. 
Before you spend crazy money on cables this is what you do first:

Open up your speakers and check the wires that connect the binding posts or the crossovers to the speakers inside. 95% of the time it's cheap no name, no brand, nothing special, basic copper wires inside the enclosure before it reaches the woofer or tweeter.

FYI...
“Proper copper” is all you need to pass the signal along...with all the noise present and intact.  Transparent cable will remove it and lower the noise floor dramatically.  Everything else is just cable!