Upselling is proven to increase ecommerce revenue, with targeted product recommendations responsible for up to 30% of revenue. In fact, back in 2006, Amazon reported that 35% of its revenues were a direct result of its cross sales and upsells. It is also a lot easier to sell to existing customers than to start from scratch with new customers and offering the right upsell at the right time can even earn customer loyalty. Analytics show that customer lifetime value increases when you upsell.