I have mixed feelings, in general, with regards to "shopping" at a store with no intent to actually purchase anything. I can see both sides to the argument.
However, I'd like to share this little anecdote: A few weeks ago my g/f wanted to go to Best Buy. While we were there, I went into the Magnolia A/V section. There were 8 salesmen and I was the *only* customer in the area. Five of the eight salesmen were in the room with the big projection theater and were watching an NBA game with audio levels so loud that it was interfering with my ability to hear music in the room I was in (adjacent room).
Noticing me in the speaker-listening room by myself, one of the salesmen dropped in and asked I he could help me with anything. I told him I was just browsing the speakers while my g/f was in another part of the store. He said since the adjacent room was so loud, he'd show me how to work their setup and then leave me alone in the room to listen to whatever I wanted, with the door closed so I could hear better. Very nice of him. Not two minutes later, one of the salesmen comes out of the projector room, sees me by myself in the speaker room (with the door closed), and so he comes in and berates me badly for being in there by myself with the door closed. He was ticked off. I explained to him that while he was busy watching the game next door, another salesman had set me up and left me good to go, and that that other salesman had said it was perfectly OK to close the door. This guy didn't buy it one bit, and told me that I shouldn't touch anything, and that if I wanted a "proper demonstration" of their speakers, that he would do it for me.
I told him that for a proper demonstration of their speakers, they should have placed them in the room a little better. The room is rectangular, and they had all the speakers lined up against the long wall (one pair in the far corners, the next pair inside them, the next inside them, etc, until the middle most pair were right next to each other in the middle of the wall).
He gave me a puzzled look and then started to tell me that they carry "Bowers and Wilkins, the premier speaker company in the world."
For every new thing I learn, I forget two things I used to know.