how active you are to get $2 from the community
Spend as much time as you can trying to help out. The actually amount of time needed to get $2 may be as little as few minutes per day, but that depends on how you participate.
There is no hard and fast rule or anything. It would ruin this if people tried to gain the system. But to get $2 I would say good quality answers and replies will get it pretty easily. bad quality answers and spamming will be way harder to get any reward.