After-Sales (售后服务) Overview After-sales is everything that happens after a customer makes a purchase—onboarding, support, follow-up, and relationship management. Most creators focus 90% of energy on acquisition (getting new customers) and 10% on retention (keeping existing customers). This is backwards: acquiring a new customer costs 5-7x more than retaining an existing one, and existing customers spend 67% more on average than new customers. The core principle: the sale is just the beginning, not the end. Exceptional after-sales transforms one-time buyers into loyal customers who purchase re…