I refer to my own 'comments' page to explain how the system works.
That long green line indicates how many comments you have successfully made over a 30 day period. It starts in the left corner and goes right until you have completed 50 comments. In the meantime, you are required to have an approval rating of 80% or more and a skip rate of 20% or less.
The 'comments submitted' might be 45 today and 42 tomorrow without any action on your part. This would be because you have shifted into another 30 day period which shows less comments.
You might wonder how will you ever reach to 50, if the numbers keep falling off. How can you achieve this if your count is, say, 10 ?
You have to find a way to get there and stay there because in order to earn, you will have to have completed 50 comments in the 30 day period, and in order to keep earning, the number of comments cannot go below 50.
Let's look at a way
After the 50, I understand I need only maintain it at fifty, 53, etc, and the cash credits will add up. I've been commenting but not consistently. That changes from now. In the meantime, kindly let us know the kind of daily earning range we are looking at here on average?
Cheers!