I can't imagine any cable believers thinking there's a difference between say, Furutech and Neutrik in sound.
The only jobs for plugs are to maintain safe electric connection between wire and connectors on components.
I believe there might be a difference between cables costing 5 dollars and 500 dollars, but not between cables costing 500 dollars and 5000++ dollars. Everything above 500 dollars are probably due to psycho acoustic. The more you pay for your cables the more you want to believe they make a difference.
500 dollars is just what I think might be the limit where everything costing more is a waste of money. The real limit might be 700 dollars or 1000 dollars.