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
Well, I’ve heard and owned a lot of these designs and they are mostly variations on a theme within a narrow band of performance criteria.  Cable Du jour if you will.  Wire is wire no matter if it’s in a tuxedo or Goodwill attire.  The range of what sounds “good” to any given human is as variable as our genetic makeup.  So...it’s silly and of little value to argue over the minutia between wire manufacturers unless something exceptional is being offered that can actually enhance the listening experience across a broad range of fellow music lovers.  But alas, we are not wired for consensus or even happiness it seems.  We prefer to argue, disagree and dissect that which may even have only the subtlest of differences when we could be discussing great music and it’s importance to our lives.  Granted, that is for another post, but the music we listen to is probably indicative of the type of equipment we use.  
I found the following interview interesting -- clearly Chris has put a lot of time and thought into his designs and his commitment to bringing cables at very accessible prices is admirable (I still fondly remember my Illumanti D60 back in the day). Also I really relate to his business philosophy
https://parttimeaudiophile.com/2018/03/20/black-cat-cable-a-history-with-founder-chris-sommovigo/

Chris IS a Shaman for sure but offers only more of the same variations I mentioned earlier.  Some designs sound brighter, some emphasize bass or midrange etc..  
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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.