Most SEO agencies cap out at 30 percent margins because retainers are...

https://bizzmarkblog.com/what-mistakes-do-agencies-make-when-they-try-to-ship-software/

Most SEO agencies cap out at 30 percent margins because retainers are labor-heavy. Build tools from your internal workflows to hit 70 percent margins through software instead. Start treating your agency like a lab for building your own products.