Traditional retainers stall at 30% margins because of the manual work required...

https://www.apu-bookmarks.win/if-you-re-stuck-at-30-margins-on-client-retainers-you-re-working-too-hard-for

Traditional retainers stall at 30% margins because of the manual work required to deliver results. If you turn your best processes into internal software, you can easily reach 70% margins. Treat your agency like a lab and start scaling your own products.