We at Mac's feel Gandhi says it best.
A customer is the most important visitor on our premises, he or she is not dependent on us. We are dependent on them. They are not an interruption in our work. They are the purpose of it. They are not an outsider in our business. They are part of it. We are not doing them a favor by serving them. They are doing us a favor by giving us an opportunity to do so. Mahatma Gandhi