It is a nice campaign with new feature of pay (pay per post + pay for keeping the banner) , but for how much time will you pay to members for keeping the banners in their footers? suppose a person do good quality posts and in a week he completes about 1000 posts (then his daily pay become $0.50, so you will have to pay $0.50 per day to him) and after that 1000 posts he stop to post from here for months or more then that, then will you pay him $0.50 even in this situation?
I think with that you will lose a lot of your money, My purpose is not retract you to pay members that amount but for longer survival I am suggesting you to plan a good idea about that issue, as it is going to appear in the future.
Not only that. Another problem may be people with lots of total posts already. There are users with over 10000 posts for example. Will they be paid $5 a day while in the campaign? Not to count other posts they can make.
He can pay users based on their activity instead of their post counts and payment rates based on user's rank.
Increase daily payment amount and make it for user's activity not their posts as well as making daily automated payments will great thing to implement.
I remember when bitmixer used to pay participants based on their activity.OP can implement to this campaign.