When does a high-paying client turn into a toxic distraction for a small team?

It's so tempting to keep saying yes when a client is writing you big checks every month even if they treat your team like an in house agency instead of a product company.

A couple of years ago, we had one major account bringing in almost half our revenue, but every single week was total chaos with custom feature demands. Letting them go felt like jumping off a cliff financially but suddenly our engineering bandwidth opened up for actual product improvements.

If you've ever walked away from a massive account, how long did it take for your MRR to bounce back?