Rules.
* At least 1 article per day you should submit
*Should be your own content
*2 links allowed in the article

Co-Operation
*Try to comment on every other article written by others
*Try to bookmark & share in social medias

Logic
If all publish 1 article per day with 100 members 100 articles per day and 3100 articles per month.

With 100 members bookmarking (Could get more than 1000 views per article per day)

Members Benefit
1 article get more than 1000 views within hours after publish.

For 31 articles it will be more than 31,000 views

Out of 31,000 views 10% will click your link , therefor 3100 members visit your promoting product.
So,
3100 x 0.01 x $20 = $620 min profit