I met a guy who worked in door to door sales once who told me that if he spoke to 100 people in an hour (which was his aim) he would maybe only make a sale in one of those instances. He would merrily stroll up to 100 doors and tell the people inside about the Virgin Media with Netflix deal that he was selling (other television and broadband providers are available) and 99 out of 100 times the people inside would politely tell him no/slam the door in his face/hide and pretend