This is such an insulting comment. And very common from those who proclaim to hear differences.
My primary audio system is extremely good. I picked my amp because I could hear a difference. I picked my CD player because I could hear a difference. I swap 3 different preamps in and out based upon what I am in the mood for and can hear a difference. I auditioned many, many speakers, carrying prices up to $20,000/pr, and picked the ones I liked best, because I could hear a difference. The total list price for the components I have in my system is in excess of $25,000.
But when it comes to cables, I tested dozens of speaker cables and interconnects, selling for prices of up to several hundred dollars each, but except for some really odd & cheap cables, I could not hear a difference. Believe me, my system is very, very capable of reproducing very highly resolved music.
I do use decent quality cables, like Audioquest 10AWG and 12AWG speaker cables. Some nicely made AR Gold interconnects, which sold for about $15-$20/pr for 6' runs some years back. Not cheapie lamp cord or $2 interconnects. However in my testing, I did find some pretty inexpensive 14AWG speaker wire and $5'ish interconnects which were pretty good. I do have some $50-$100 Monster, Kimber, Tara Labs and other brand name cables, which I picked up on the cheap and which sound just fine (same as my AR interconnects).