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

https://super-wiki.win/index.php/From_Internal_Hack_to_SaaS:_How_to_License_Your_SEO_Tools_to_Other_Agencies

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.