Just charging $2 might be a huge improvement over reddit because it makes sock puppets cost too much to scale.
Paying out for upvotes, I fear will incentivize lowest-common-denominator content. If you go to a quality tech subreddit and sort by "Top" comments, they will mostly be memes. They won't be from an expert solving your very specific problem. And more generally, I worry it will reward that twitter-style, shrill political dunking, binary thinking, maximalism and in-group point scoring. This may be a recipe for an even more toxic r/politics.
Very interesting trying to puzzle out how a given incentive structure will play out in practice.