Fired My Best Customer and Revenue Went Up in Three Months

They paid more than anyone else. They also consumed more of my time than everyone else combined. Weekly calls, custom requests, escalations that weren't escalations.

I fired them. Politely, with a transition plan, and a real reason they could understand.

Revenue dropped for three months. Then it recovered. Not because I replaced them with someone bigger. Because I finally had time to fix the things that were causing everyone else to churn.

The customer I was most afraid to lose was the one keeping me from building a product that didn't need me.

Have you ever let go of a customer who was technically your best one? What happened next?