There are plans to add subscriptions as a servicie which users will pay for getting access to service layers (more storage, no ads, no moderation, etc).
To enable users to sell content is attractive, and I think that it could be a great addition, looking forward for it.
I'm all in for this kind of money making features and I hope to prepare the system for such things. The addition of video, tags and headless API is all about preparing Chevereto for the money making stage.