I have to recommend that this platform doesn't give users a profit motive. It encourages quantity over quality and only "front-page" worthy content. Niche communities won't get traction this way. A few Gallowboob-level posters will be making most of the profit.
That's not to say that a financial incentive is a bad idea, though. If you capped the amount that a user made per month to the cost of their subscription - $1, then there's no profit for users to make. They're just saving money on the subscription cost.