Since I am a big fan of Seth Godin, I will keep talk about the purple cow. In one part of his book he talked about Mouth to Mouth Advertisements. He said that the best and the cheapest way to advertise are mouth to mouth. When you offer a good service that is it. Every one will talk about your good service. People trust each other and they don’t trust advertisements. If you have the best sales force on earth, and they are trying to sell very good products, they will have hard time doing it because they are sales people, and most of us don’t like sales people. On the other hand, if your best friend...