Zenzuu - I have a question regarding Zenzuu

A couple of my friends are recommending that I join them at Zenzuu. And when I ask them why the answer is pretty much this:

"The Zenzuu Worldwide Advertising Revenue Sharing Program is perfect for all the people who could not afford to come into a costly MLM company. Learn how you can earn money by telling people to join for FREE and getting everyone they know to sign up for FREE."

Now I understand that 80% of advertising revenue in the future will go to the members. So can you please help me out and explain to me where my thinking is going wrong below?

When Don F. has 1 million members in Zenzuu and the advertising revenues are say 10 million dollars per month, each member will earn 8 dollars per month and Don F. will pocket 2 million per month.

I would really like to understand where all the enthusiasm is coming from regarding this revenue sharing program, but I just do not see it, and my friends (so far) are unable to explain it to me.

PS. Before we receive more defensive responses from ZenZuu members, please appreciate that the question is not about Zenzuu as a social networking community, but about the real money value of a revenue sharing program for its members. A revenue sharing program may sound great in theory, but what can you expect to pocket as a member of the community?

PPS. As you will read in the comments below, one of my assumptions was completely wrong. The expected advertising revenue above of 10 million dollars should be 20 times less at around 0.5 million dollars per month, bringing the average monthly earnings for members down from 8 dollars per month to some 40 cents per month.