One time, I'd been comparing bits of hardware for quite a while, and was accosted outside. I didn't have to, but I emptied my pockets to prove that the guy had been wasting his time. Or, they may want to discourage anyone unfashionable from cluttering up their decor. I don't go to expensive stores - maybe the help there has to look busy, or hope for commissions. One friend of mine was shopping for hardware, and trying to figure out what would fit his repar job, but he couldn't focus because he had just heard about a friend having died. He gave up and left, forgetting he had a dollar's worth of stuff in his hands along with his own sample bits. He got hauled in and lectured, and forever after, that same clerk watched him like a hawk. He could have invited the high school in to shop free while he was there.