It's really easy to do it if you are motivated for the reward. Just get a free day and post as much as you can, you will see.
I would recommend to post only in about 10 threads with interesting subject and then just post mainly in those threads.. ask questions, answer questions, try to be helpful and such.. I'm trying to set it like this:

1st day - 100% posting and maximize earnings, try to do around 100 posts
2nd day - post only if you have free time at pc and only if you are super interested in the thread you choose to post in, have a break
3rd day - same as the first
4th day - same as the second
etc. etc.

This system may change based on my real life situations but I want to keep it like this, I'm not even tired or frustrated.