Retainers usually cap your margins at 30% because you’re trapped selling hours....

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

Retainers usually cap your margins at 30% because you’re trapped selling hours. When you turn your agency into a lab and build your own tools, you can hit 70%+ software margins. Stop grinding for service fees and start building something that scales.