When you look at modern advertising you’ll notice that a lot of today’s billboards, tv ads and print commercials are focused on persuading and courting new customers. That’s because in the eyes of most companies, extra customers quickly translate into extra revenue. While gaining customers indeed boosts revenue, not losing any is proven to do so faster and at a much lower cost. When someone is not familiar with what you have to offer, it will take a lot of persuading to get him to buy your products. But when somebody already knows you and has taken a liking to your products, it will not cost you a huge effort to get him or her to come back for more.