Re gas pumping. An atendant can pump maybe three-four times more gas per unit time per pump. So if real estate is a premium, a attended station is the way to go. Or in a very competitive area, because of the bigger volume.
Although I have not received gas pump training and not highly skilled in that area, I am quite sure I can pump gas into my car in the same amount of time as a "professional" gas station attendant. I'd be interested in seeing your detailed analysis. :-)