Being able to simply swipe a card at the pump and get exactly how much is needed is very convenient. Having to go inside the store, wait in a line, and then wait for the receipt to print out seems like time wasted. At a full-service gas station, paying with a credit card means waiting for the employee to go inside and wait for the receipt to print. Also, to say that customers should be served by people who work in a fume-filled environment all day for a low or minimum wage does not make sense. To my mind, the future of work should be better than simply reversing automation to create more low-skilled jobs.
Self service is no service at all.
In this way may evolve a rationale for paying people for consuming.