"... walk into a store and tell the owner that he would like to give the amps in storage a listen because he’s never heard them, and he might be interested, and then expect the owner to say sure, come back tomorrow because it’s going to take me a few hours to get them out and set them up?"
That is exactly my experience when looking for a bicycle. Except that the salespeople insisted on doing it and I was trying to dissuade them.