I use to think similar about speaker cables as Tim clearly stated above. However, I actually tried some quality cables to replace my 12-ga Crutchfield stranded wire and was shocked by the performance improvements. Even my wife commented that she could hear an improvement. It’s not a fairytale!
Double up on speaker cables
I have 2 sets of good speakers cables. Tara Labs and Audioquest. The Tara Labs are detailed and airy. The Audioquest carry more mid bass but are less airy and detailed. Can I connect both at the same time and benefit from both? One with spades and the other with bananas! My speakers are Rockport Atria 2’s and are not bi-wireable.