This is what I could find.
How Are The Earnings Calculated?
We pay out a high percentage (80%+) of the ad revenue that your videos earn. Your earnings are based on the views of your video times the ad rate. The ad rate is calculated based on the performance of the ads around your video (clicks, user country, sales).
How Much Money Will I Make?
In the Model Payment Program, you are paid a percentage of the ad revenue made on your verified videos. The percentage of your payout is dependent on the performance (views and rating) of your video. Check your earnings tab often to track your earnings! Note: You must be logged in to access your earnings tab.
For an example, the average RPM for 2016 was $0.62, compared to $0.44 in 2015.
Hope it's helpful, not that it answers everything.