I've said how I hate to do people first thing in the morning. So a self service checkout is not purely about service efficiency but also about what I like.
On an early morning run the closest supermarket to me is a Coles. The second closest is a Coles. But my experience has been that Coles do not open their self service checkouts early in the morning. Coles seem to think that self service checkouts are purely for managing volume.
So I had to drive to Woolies.