I used to have people over to listen to the system when I was more active socially. Many times a person would come along with a single CD and ask to play a specific track. You could see they were making a judgement of the whole system based on one piece of music that presumably sounded good on their own system at home. Crazy. It’s the same at shows, which is why some vendors are reluctant to let people play their own stuff.
I don’t have the problem these days as I’m deep under cover.