why do people feel the need to buy expensive cable

It seems that the OP got more than he bargained for, soliciting input on the perceived value of cables.  FWIW, I have really tried very hard with lamp cords, DIY cables but there is a limit (mechanical, metallurgical, chemical) that is reached when you get beyond a mid level system.

Not unexpected, some religious wars and some kind of flaming started...some pointed comments are refreshingly true, some soaked in sarcasm on the other hand made my day! I needed a napkin.

Similar to Amazon comments, posters should have the "verified purchase" icon so it would be easier for the casual peruser to see who has bought some cable of value ($-wise, not always sound wise) and who has not, who has a great system and ears, who has supposedly a $24k cable and some JBL speakers (sorry, couldn’t resist that).

Let your ears be the judge and, as always, the beauty (of the sound) is in the eye of the beholder and taste certainly differ.

What’s next: does the thickness and the polish quality of your amp front plate make a difference?

I would like to add some cables bring me closer to the music. Some of the cheaper cables sound like you threw a blanket over the music. That is usually the case when I have compared. It just depends on the what you've heard I've heard some really great stuff. Some people never have the opportunity and I'm thankful that I've had the ear candy that most people never have the chance. We all have different experiences. Enjoy yours.

I will also add, I  have taralabs omega 12" jumper cable's on the jbl bi-amp L7 speaker's that is far beyond the brass stock plate that completed the circuit for single speaker cable's,  that addition was incredible! 

@jazzonthehudson I agree, your ears have to be the judge and I have actually heard or have owned the cables I speak of for extended sessions.  I can't speak on those I have not. I just know that I have came a long way from the Audioquest diamondback back in the day. I guess you have to be careful. They sound like blankets to me now

Matt M. stated the following:
"I spend my audio dollar mostly on equipment, rather than cables. I buy cables that allow me to feel much more connected to the music, and I dismiss the rest. I use for MY system (made up of all separate components) low to moderately priced cables... Morrow Audio and used Nordost cables. The used cable market is very good btw. The right cable for any ones own system will vary greatly by sound and cost. IMO".
regards,
Matt M

Had to laugh because this is exactly what I use for my system.