Value is very subjective. We can't really tax posts like that. And, as it is now already, the whales decide what makes it big and what gets forgotten. If a whale upvotes your post, you'll get like 300$ in an instant.
BUT they also upvote trash occasionally. (then again, it's subjective)
I think the system works right now as it is. We just need more people with more voting power that will upvote posts that otherwise get lost in the torrent of new posts.