Have you thought of payed superscription model for steemworld?
For example 1SBD monthly per user. This I think is very cheap.... you can go easy for 2 or 5. But lets say for starters 1.

I bet you can get 1000 supscirbers for 1SBD, meaning 1000 SBD monthly, or more .... that is a secure income that can easily go up .... balance between no of subscribers or fee ....

You can even make like a light version (very basic) free and advanced with subscription.