No referral will get 3$ and referred person who join forum means you will get $5 after you become premium member and i don't think for that you need to make good and quality post you can easily reach 120 post in one day also just stick to contest and give best time and keep activeness for one month...
No it's not like that. He will be paid either 3 or 5 depending upon his usefulness of his posts. But his referrer will get definitely $3, no matter whether he earned $3 or $5.
Thats why I am wondering how to define the usefullness. Anyway, I will be posting equally on the thread that interest me, no matter it is contest or not.
You have to just make posts as you do in other forums. That will lead you to get $5. There is nothing special meaning for usefulness of posts. Only if anyone spams by writing short or off-topic replies, he will get $3.