Marketing is a numbers game. This maxim is true, although it can be viewed from several angles. Proponents of bulk email advertising and traffic exchanges contend that if you expose your message to a vast number of people, only a small percentage of them need to become paying customers for your business to substantially grow… and they're right. Conversely, however, if a high percentage of the people who see your message become paying customers, you only need expose your message to a small gro.