It's like going to the supermarket to buy some onions, and then just hoping somebody will walk by and offer you some.
Or anything else. A friend once complained bitterly about the lack of customer service she got in my favorite independent book store in town. She went there because I'd recommended the place, but was upset afterward.
When I asked her what happened, she said they'd ignored her when she needed help. Since that is so unlike the staff there, I asked her a couple more questions, and it turned out that she hadn't actually asked anyone there for help. The way she put it was, "I just stood there with a confused look on my face, and nobody asked if they could help me."
Well, that's just dumb. I told her that the staff there aren't mind readers, and are used to people who prefer to be left alone to browse, but will ask for help if needed. They don't go around intrusively asking people every five minutes if they need help, but just figure if people want help they can come and ask for it. It's not like it was a huge store, and if they didn't have what people wanted at the time, they would order it in. That's how I acquired most of my Doctor Who and Fighting Fantasy gamebooks. This was the only bookstore in town that had a clue about ordering books from the UK.
Well, it was news to my friend that if she wanted help she should approach a staff member and ask for it. I figured that it was probably that she wasn't used to bookstores (she's not a collector like me, or even someone who reads that much) and how most people who shop there prefer to be left alone unless they can't find something.
It's not easy to find that happy medium of staff who are near enough to ask when you need to, and staff who can tell when you'd prefer to be left alone. One clerk decided to ask me three times in the same 5 minutes if she could help me, and didn't seem to understand, "No, thank you." Finally I said, "I already told you twice that I don't need help. If I want it, I'll ask."
Much later I found out that this is one of the things store clerks do when they think they've spotted a shoplifter... keep harassing them in hopes of either catching them or annoying them so they'll leave.