What is the ruling on dealing with the company (Prime Bank), which relies on paying 50 dollars, with the participant receiving 30 dollars for bringing six people?

If the fifty dollars represent the true value of a commodity or a wage for work, then receiving a commission for bringing people to deal with the company is permissible, provided that the dealing itself is permissible. However, if the fifty dollars are merely a subscription without a commodity or work, or if the actual value of the commodity or work is less, then it is considered prohibited gambling.