Retainers usually cap your agency margins at 30 percent. Use your shop as a lab...

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

Retainers usually cap your agency margins at 30 percent. Use your shop as a lab to package your manual workflows into simple software, which consistently hits 70 percent margins and gives you a real asset.