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
A good medium priced Cable is the least you could do pending on your system 
I don't buy expensive cables.  I buy the ones that sound the most incredible (actually, they don't sound like anything at all).  Just so happens that those are...expensive.  Cables tie it all together.  That system should give you goose bumps.  
Taters

I doubt that your system is completely to blame for not hearing enough of an appreciable difference in the way your system and music sounds.

The only way to determine if a cable will make an improvement to your system is to play it in your system. 

Perhaps getting brand recommendations from 'goners based on their positive results will be a useful guide. 

Suggest:

Consider including all categories available such as: power cords, digital power cords (for cd players ) - (JPSLABS for example), interconnect cable, speaker cable, and digital interconnect cable - (between transport and DAC).

See the lending library at THECABLECOMPANY.COM
also,  JPSLABS.COM

Keep trying !
people feel the need to buy expensive cables because they lack the technical knowledge to distinguish snake oil sales pitches from real engineering

mystics chants of "everything matters" and "skin effect" are helpful to delude these poor people

you might also ask why are some people anti-VAXers
Science is as much a religion as  any other .
The reason people do anything is a search for meaning and hope .