Here's an Idea: See how many people show interest in paying for it, and how many do not want to pay for it. If it's worth it, let the people not wanting to pay for it summarize it for "free" access to your service, now you don't have to write the summaries, you just approve others' summaries.

Just an idea, also sounds like a fun project :)

Yes, all of the summaries will be hand-written. At first it will be me with my significant other as backup, however I would be trialling writers with the aim of outsourcing so long as the quality/reliability was there.