So I am trying to comprehend what you mean.

Would this be possible:
Mint coins for artists (photographer for example).
Coins gain value every time a user likes a piece of work (photo) by distributing ad revenue.
The user gets an artist coin every time they like one of their pieces of work.
The user’s coin portfolio would grow as they like things, and they could sell their coins if they like.

Is this what you mean by an attention economy?