You have to be whitelisted in order to recieve auto-tips and to participate in the referral contest.
I hangout there for almost a month but im still not white listed
I don't think it's easy to earn free mBTC there but at least it has lots of nice people to chat and say interesting stuff and the level of conversation is really good.
I can say my time spending there was really fun
Not anymore, even if you're unwhitelisted you can earn a bit.
What is your avarage earning on this site? For example per post or per hour of chatting
Don't focus on the earnings. They're an incentive for you to use coinchat, not a day job.