Service retainers usually cap your margins at 30 percent. Stop just selling...

https://dibz.me/blog/why-a-handful-of-european-seo-agencies-stopped-being-agencies-and-1138

Service retainers usually cap your margins at 30 percent. Stop just selling labor and treat your agency like a lab to build your own internal tools. That shift lets you build software products that hit 70 percent margins and beyond.