It's not just that people are lazy and don't want to drive to a supermarket. It's also because they don't have cars.

My neighborhood is close to downtown, where there are no grocery stores left. My street has a few apartment buildings, one specifically for people in wheelchairs, a lot of elderly people, and one slum complex tucked away that rents to people with no credit rating. The IGA that catered to them burned down, and was replaced pretty soon with a Dollar General and many are grateful. They are still being charged a premium, even though the "convenience" is absolutely necessary for them.