starbucks is basically just a classier version of the standard fast food joint. Also, you will probably have to work less because more people visit a burger join than would visit a coffee place, except during rush times like 4:30-8:00 AM. Also, people usually go in coffee shops and sit around, meaning you can be like "look boss, the place is packed, i'm doing my job here!" when those same people ordered something an hour ago and haven't moved since.