Why Churn Becomes a Serious Growth Problem at $100K MRR In my decade of consulting for B2B SaaS companies, I’ve seen a consistent inflection point appear around $100K MRR . At this stage, founders have achieved product-market fit. They are past the $5K–$50K MRR phase where growth depended on founder hustle, manual support, and direct customer conversations. But this is also where the growth math starts to break. The retention tactics that worked early no longer scale. Founder