Oh, interesting questions @rejoiceavl... the $ amount that shows up at the bottom of each post actually fluctuates daily according to the market value of Steem. So before payout it can go up, down or stay the same (but for the most part it's always moving). Crypto is volatile :)
All posts are divided to curators and authors regardless of $ value. I don't believe there's a cut off point anywhere.
OK thanks alot for clarification.