Service retainers rarely push margins past 30 percent, keeping you trapped in a...

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

Service retainers rarely push margins past 30 percent, keeping you trapped in a cycle of trading hours for cash. If you use your agency as a lab to build internal tools, you can unlock software margins of 70 percent plus. Stop servicing and start shipping