Most SEO agencies are stuck in a service trap that keeps margins around 30...

https://www.bookmark-help.win/client-retainers-usually-cap-your-margins-at-30-percent-instead-of-just

Most SEO agencies are stuck in a service trap that keeps margins around 30 percent. If you turn your internal workflows into a simple tool, you can hit software margins of 70 percent or more. Stop selling your hours and start building an asset.