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
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.
Lak you are so right.  I look at these type of threads and it goes in circles.  Look if you have a decent system give it decent cables. Use them to tweak or enhance and enjoy.  If you don’t believe then stick with your chicken wire 
"It’s audio if it sounds good to you buy it! Ah duh!"

That's pretty much why Bose has sold tons of junk. 

I used to draw nude women. I'm pretty good at it. One of the things drawing lifelike nude women teaches you is how to study shapes and proportions. I realized the more nude women I drew, the less I liked what's typically called a sexy woman. I also realized that the interactions between light, curve, and proportion are where the beauty lies. It's a proven fact that people who practice creating visual art consume it in very different ways that those who don't. I find listening to be a similar practice. The more I listen, the more my tastes diversify and the more I listen to what my stereo is really doing. "Sounding good" isn't a standard I find myself ever using. "Sounding good" is an abstract conclusion drawn from the assessment of many factors. Are the hips wide enough, or not enough? Is the bass too round or too punchy? Are the breasts set wide enough apart, or too close? Is the soundstage too etched, or just hazy enough to be more convincing? Just like "sexy" is emergent quality of many factors, "sounding good" is as well. 

That's my take on it.