Using Clay for Firmographics: Strategies and Best Practices

We use Clay for specific actions, but we are using Clearbit to maintain firmographics in Salesforce. I would like to use Clay for both, but can't quite think through the setup to maintain 10K account firmographics without A) burning through credits for no reason, and B) processing that many accounts at a time. Do other use Clay for keeping basic firmographics up to date in their CRM? Or are you using a more purpose built tool for this?