@kdfrawg One of the reasons often cited is jobs creation. The rationale is that you'd have to hire more people, some to run the inside of the station and others to do the service. But, what happened, of course, was that everyone just ended up waiting for the (often) sole employee to do all of the tasks. It's pretty silly. And, very disconcerting when you go to Oregon and aren't allowed to pump your own gas.
// @peemee