They probably don't care whether you buy or not. These hourly employees don't make a dime off the sale. They would rather get back to finishing that cigarette you interrupted, than try and remember how to work the register, which they haven't had to do in three days.
Yes, But there is something else: Erosion over time. How many people begin a job intending to do well, move up, move sideways, or otherwise make the most of it? And, how many people are dragged down, pushed down, pulled down, put down, disheartened, de-motivated, or otherwise derailed by the hostility, the neglect. the politics, or the whatever that torpedoes their boat?