I started my career in sales. In sales, you very quickly learn that it is much easier to sell to an existing - rather than a new - customer. The fact that existing customers are valuable isn’t a tough concept to grasp. Customer loyalty researchers report that, on average, companies lose about 50% of their customers each year, that it costs 20x more to do business with a new than existing customer, and a minimal reduction in customer defection rates can significantly boost....