I like some of the ideas, but this brings a lot of problems. Why would this encourage good curation?
If you get 50% anyway, upvoting any random shit is just fine. We currently have 99% upvotes and 1% downvotes per day...
If there is no benefit of good curation, why would people do good curation?
Also, your proposed centralization of power worries me. I don't want like three curation giants to be the main deciding parties of what is good content and what goes to trending...