Referral needs to post minimum comments as well in order for the person who invited to earn $1. I hope more options like raffles and thread earning will be added soon here to reach $1 daily in most convincing and easy way.Bizdustry set the maximum amount of daily earning at $1.
So if you are able to complete your daily task you can be earning $1 everyday.
A single referral also gives you $1 as well