Yes this is difficult. I think it would help the site have good content with fewer accounts to have rewards for each category . However locking them by category if there were lower demand would be unfair.
Compromise Awards are allocated by number of root posts In a heading. Something like steemit where everyone post would get the best rewards but the best post in each category would also get better rewards. The top politics post would do better than a middling steemit post even if it had fewer reads and votes but would never be as good as a top steemit post.
Splitting rewards by post category is a really good idea, and should be considered as a long term investment in the platform. You could think of this in two ways:
I've started a series about using graph theory to grow the Steemit network that will discuss these ideas in more detail.
I was thinking he same thing. Although I think there is a balance between being everything to everyone and specializing.. The cryptocurrency news and thoughts here is very good. This will be go to place for crypto news if not already. It will be first and most in depth . But you can't go from there to celebrity news. You need to seed a few adjacent areas, where the participants will overlap. Maybe libertarian maybe technology maybe academic economics then try to draw in content with outsized rewards.
I would support that.