Most SEO agencies get stuck at 30% margins because they are trapped by client...

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

Most SEO agencies get stuck at 30% margins because they are trapped by client retainers. If you turn your internal workflows into simple software, you can easily hit 70% margins. It is time to start treating your agency like a lab.