TBH, we think you should charge more: clients should be inclined to use the free model. But not so much that it's impossible to cover with advertising. :)

We plan to iterate on the pricing every 6 weeks until we find an optimal growth vs. spam.

And yes, there's a liquidity problem in web 3 marketing, whereby advertisers want to pay a rev share as users monetize while publishers want revenue up front. 

If only the blockchain had solutions for liquidity problems...some way to provide it and get paid a fraction of the upside.

Searchcaster