Service with a smile

In class we have discussed what we expect in a service interaction and how that effects our thoughts on the store, restaurant, etc. If we are not happy with the service we usually don't go back and therefore the store loses customers and profit. This is why managers push for service with a smile and giving the customer the best service possible. I've noticed over the semester that in the commons student employees don't look happy to be there. They often work slow and may not always care about the quality of the food. Of course this is not true for all students or workers in the commons but it's something I've noticed. I wonder if managers in the commons push for friendliness and quality work or if it doesn't concern them because they know they will get the busniss either way. Students go to the commons because of their meal plans and it convenience. However, if there was more incentive to make a profit would there be a push for better service?