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
everyone knows some have the ability to see fine print others cannot. everyone knows some can taste ingredients others can’t detect. some minds solve puzzles faster than others. there are varying levels of skill and ability in all endeavors . if you have an ability I do not possess I will not declare you wrong. eyes, noses, tongues, minds, hands, feet, and hearts come in varying capabilities. why would anyone purport all ears to function identically?
Because the brain can make you see, hear, feel, smell and taste things that do not exist.
Post removed 
Except, Elizabeth, the "subtle" (positive) changes that exotic cables may or may not be able to achieve, are reported as "jawdropping," dramatic," "night and day," etc.  If switching out a cable can make those kinds of improvements, you would have had to have been previously using metallic thread.

Additionally, cables shouldn't introduce anything into the music program, they should only eliminate outside interferences.  Anything else you "hear" after switching cables, IMO, is voodoo magic.