Have you thought about putting together a referral team so that everyone can help to make a bigger profit on the site and even everyone win the prizes on the site? 
Referral team? Tell me more.
... I came to a conclusion that would take more than a year. With a reference team it would be possible to reduce this time with the participation of all the courses, and to repay this help would be the distribution of prizes for the members who helped!
Ahh, I'm with you. You can recruit as many referrals as you want! They just have to be honest referrals...you can't set up a bunch of accounts referred by you.
I've tried to get people to share their tips for gaining referrals, but that talk has faded some. Are you familiar with the referral URLs for your forum signature, website, or emails?