When I was filling up at a self-serve station today -- which is about the only kind you can find anymore -- I noticed this on the pump. There is often only one person behind the counter at the gas station, and it's not really a good idea for him to run out and pump gas while leaving an entire store full of goods with no one to watch it.
It really made me think about what some people have to go through just to function in this world. If you're able-bodied, tell me the last time you had to make an appointment to put gas in your car. It makes me realize how lucky I am, and how we still have a long way to go to make our society viable for everyone.