If nothing else, I'd like to at least make it easier for startups and small companies to have somewhere to find what these requirements are. Maybe this ends with howtosubscribe.com being a labor of love to help organize the net's plethora of newsletters.
If your proposal of selling one or two and then expanding from there. This idea would probably be suited better for someone with history of selling newsletter ads. For me, it'd be a problem of being the "wrong person to execute". Something I hear Chris Dixon & PG mention a lot.