The problem that every social media has is that manual moderation does not scale; even with tooling, the major platforms like Facebook employ thousands of content moderators as contractors, a lot in low-wage countries.
Having an army of willing volunteers helps, but it's not good enough because these are unpaid, untrained people without the psychological helplines that professional moderators have. I hope Reddit has good tooling to prevent the volunteers from seeing the worst of it.
That said, I do think that everyone contributing their time to social media like this should get a cut from the revenue; I'm 100% confident Reddit has exact numbers for the value per subreddit and even per post, so they can apply math and give the moderators a percentage of that, and even the posters of good posts.
I mean yeah then you get the problem of reposts and simple copiers, but that's already an issue, it's just that the issue is karma instead of money.