( rewards come from engagement.)I think this is feasible, although a post is curated 50/50, if there is NO interaction there is no movement, let me explain: Users are a fundamental part of this panel and in any activity, AN artist goes on tour, if people do not attend the economic losses for the artist are many, so everything is a gear but users are a fundamental part. For example, I work in marketing, I carry out a project, it goes through several people, it is approved, at the time of execution, the CLIENT is the most important, if there are no sales, this whole process is lost
Proof of Brain is how the blockchain platforms are designed to reward. Today I believe it doesn't work like expected mainly because too many never use the right to vote which is only a question of hitting that button - a minimum of 10 times per day. The higher the SP the higher the vote but also the more one can vote (different people can benefit).
So if no one comments and large number never upvotes it won't do the PoB system any good (see the whitepaper of Steemit).
I the case of marketing I understand that the client is most important but,, that client pays for a certain service. It's not that he receives your idea for free and gives a vote (fee) or not.
In this case we all use a system (a plan, idea) and benefit from it even if it's little and if you can do this for free with a chance to generate an income (we both can but many others can) I do find it normal to invest in what keeps you alive.. investment in this case by upvoting and commenting. (I don't talk about buying Steem) just those simple things anyone can do.
The same for voting for witnesses and proposals. I understand many are too difficult to understand and not written for the average Steemian, A change of approach, connecting with the voters wouldn't be a bad thing, although it's all very time consuming,