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I think there's also potentially value in making heavy-use of the features a paid-for feature. For example, if non-paying members were not allowed to submit more than 1 post in, say, a 24 hour period, that could: (a) encourage careful selection of what to post, reducing the "fun" of posting image memes or trying to "karma-whore" (b) add perceived value to the cost of a subscription, potentially increasing uptake I know that's a controversial idea, but honestly: I'd be willing to pay to get better-curated content, and this kind of move might do that.