Most SEO retainers trap you at 30 percent margins because you’re selling time....

https://wiki-aero.win/index.php/Why_Europe_Dominates_in_Practical_SEO_Tooling_(And_Why_Silicon_Valley_Misses_the_Point)

Most SEO retainers trap you at 30 percent margins because you’re selling time. By turning your internal workflows into a simple software product, you can push past 70 percent margins. Build a lab instead of just another agency.