Qoinpro has turned scam . It used to pay earlier and yes it was based on referral system . Their method included following :
1. Make as many referrals as you can .
2. You dont need to use qoinpro to get bitcoins daily , it will automatically increase everyday .
Even the amount they were paying was little enough , it could not become successful . What I think could be the main reason behind it is that users rarely returned on their site generating no revenues any longer .
Qoinpro is scam he never allow user to withdraw his money, altough you deposit some satosi you still can't withdraw it
Qoinpro use user database to promotion some site, that Old method in internet marketing trick