Ah, so when (hypothetically) there are only two posts with votes, both with $5 rewards and one gets zeroed out by a downvote, the payout for the other increases to $10?
It's interesting to know how it really works. I think many people don't know how it works.
Yes that example is correct.
Another interesting point is that if one post gets massively more upvotes, its rewards will increase to say 9.99 and the other will decrease to 0.01 without being downvoted.
Downvotes and upvotes are both ways of allocating the pool between posts.