Thanks for the considered response - Despite its simplicity, I think your categorisation works and I'd certainly like to tap into and increase the third group.

I've often thought that the main problem with Steemit lies within the main reason that many are here - money. No matter the situation, where there is money, the corruption finds a way of getting involved. And perhaps for this reason, a social media platform the monetises its users in this way will never truly be a social media platform. It will always be primarily a tradeable cryptocurrency that will attract users wanting to mine more coins - but instead of algorithms or processing power mining the coins, it's done through content creation and curation.