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W.r.t revenue and moderation - the key here is to enable the incentives for user visiting the site to somehow enable content generation, revenue and moderation. For Reddit, karma only fulfills the first. The challenge is can you make influence on hubski somehow tie to revenue and moderation. For instance, if someone finds and marks spam, can that give them influence? Is there a way to trade between dollars and influence? Is there a way to do this type of linkage and keep the community and camaraderie?
Redditors often argue that karma is make believe number, where in reality it is the most tangible evidence of social influence and worth - essentially karma is a quantification of worth in the reddit community. So I see the key for hubski is equivalently ensuring that popularity ties to the behaviors that you want to promote.