We want you to make as much profit as is reasonably possible in your route business. Because you will stay longer, serve subscribers better, and build more circulation for the newspaper. Service definitely helps keep existing customers sold as well as easing your ability to gain additional ones. While you can't control product content, you definitely control service quality. The more customers you have, the higher your profits should be.
Nothing happens until a sale is made.
Very few people will voluntarily ask to subscribe. Someone must sell most of them. Who better to do that than you, the carrier who will service them. Every sale you make increases your customer base, which pushes your profit upward. Most sales you make will also generate an incentive award for you, which also goes to profit.