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I really like that model myself. The only issue with it is that Steem Engine charges based on the active user. They define active user as someone who stakes their tokens. This would essentially make our bill for ENG tokens become astronomical to keep up with based on the large number of posts across Steem that come in. As we grow our staked ENG to support it's certainly something we will explore in the future.

Thanks for the info, seems logical and there's a lot we don't know.