Great stuff Seth, and thanks for sharing. Very inspirational.
There was a guy who posted in the Warriors' Forum about doing something similar. I looked for the post but couldn't find it. Basically he taught business owners how to build and profit from client email lists using auto-responders.
For that he charged an establishment fee. But I like your attitude best. The client doesn't want to know how to do it--they just want it done. Better a monthly fee for operating the service ad infinitum and GROW with the client than single fee for establishment.
Perhaps that's something you could add to your arsenal?
Cheers!
Alex