Sammy is the Managing Director and Cofounder of Blossom Street Ventures. Email him directly at firstname.lastname@example.orgNet dollar retention is the most important metric in SaaS. If you’re over 100%, revenue from upsells is outpacing revenue you’re losing from downgrades and churn. It means you’re keeping the customer base forever, and your current customers are a major source of growth. The latter is a wonderful bonus that isn’t well understood and may account for a significant portion of new revenue growth.