why do people feel the need to buy expensive cable

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.

So many components, combinations and cables. Find what works, what you like and enjoy it. Best advice is that if you can't stop listening that's a great sign. If your component or cable gets you there then great. It's funny how we value the opinion of folks who will never hear our systems or who stop by for a session every now and then. Trust your own ear.

Cable does make a difference, especially for badly designed equipment (eg: anything that is not mass market tends to have design issues).

Tip: Mogami cable are the best bang for the buck cable for the mid to high end speaker and interconnect cables.