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
There is no purity in just believing things! What kind of idiot just believes in things with no basis in reality? Even the religious have a truthful basis for their faith. 
It’s audio if it sounds good to you buy it! Ah duh! I don’t give a damn if it does good in some measuring lab or some blind test. This ain’t a math test. You are trying to please your ear not figure out square root! 
Not everything in audio or life can be scientifically proven.
I'm with calvinj if it sounds good to you, and you like it, buy it.
There are many threads that debate this very issue and there are no winners just debaters.