In all my years of going to the theatre, I think I may have bought something, once there. My father is a big fan of the Grateful Dead, and they had an old vintage Dead concert poster there that I got for him as a gift. Price wise, it wasn't too bad at all.
However, I do remember there was one day a couple of years ago where the weather was crazy outside. Myself and a random group of other people all had the same idea to browse around there to take shelter from the storm. Needless to say, the staff there didn't seem to like that we were there without buying anything. They didn't kick us out or anything, but they sure went out of their way to make us feel rather uncomfortable during our time there.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll