Let's say something like $5.
I would probably check it at least daily. It would also be something I would look for when trying to find, say "recipe for spinach quiche", where there will be a lot of ad-tastic and very spammy content.
Or, "things to do in Prague", when I do not want Google to start telling the world to spam me about Prague. I just want to see websites of people who went, themselves, to Prague, and want to tell the internet about it.
Or "how to build a bench", when I just want to see indie blogs where Joe Carpenter tells how he made a simple bench, without getting ads.
Perhaps also date-sensitive, so that anything indexed in the last week with the word "Italy" would show up, or "monarch butterflies", or "garden". But not in social networks (esp. not Pinterest), and not in websites with a bunch of ads.