Most SEO retainers max out at 30 percent margins because you are trading hours...

https://bizzmarkblog.com/what-mistakes-do-agencies-make-when-they-try-to-ship-software/

Most SEO retainers max out at 30 percent margins because you are trading hours for money. Turn your best internal workflows into a simple tool and shift your focus to 70 percent software margins. It is the best way to scale your agency.