Most agencies get stuck in a rut where retainers cap your margins at 30...

https://blogfreely.net/murciajpvo/do-you-need-venture-capital-to-build-an-seo-tool-if-you-already-have-retainers

Most agencies get stuck in a rut where retainers cap your margins at 30 percent. By turning internal workflows into software, you can push those margins past 70 percent. Think of your agency as a lab for building products rather than selling hours.