The ranking doesn't matter.
For the ROYALTY contract, you can consider the rough calculation.
Let's say your novel has only chapters of ~1,5k words. As you know, every 200 words costs 1 coin.
Having this in mind, you need to know that each coin is roughly $0.02.
And, after taking all the taxes, and operational costs (including taxes, servers, staff, marketing, FPs, % in the sales over the coins price, etc. et al.) you'd need ~4,700 real unlockings (meaning, not paid with fast passes) to maintain 200$ a month, considering the above scenary.
Not counting gifts, privileges tiers, or other bonus.
And that's what votes or ranking doesn't pay you anything. Of course, the ranking is a consequence of popularity, but not every paying reader votes for the novel they spend on. Some vote for novels they read for free, as a form of compensation.