Most SEO agencies get stuck at 30% margins because they are trapped by client...

https://mega-wiki.win/index.php/How_to_Keep_a_Lean_Development_Cycle_Inside_an_Agency

Most SEO agencies get stuck at 30% margins because they are trapped by client retainers. If you turn your internal workflows into simple software, you can easily hit 70% margins. It is time to start treating your agency like a lab.