Its not worth it trust me. If you lose you want to try to earn your money back, which usually ends up with you losing more money (Trust me I know from personal experience)
I wouldn't even start with it... If you do start it legit then you will get cleaned if you don't you will scam a get banned. Lose-Lose.. Unless you don't do the actual game and just have members do it... and once its trusted charge fee's to join (up to 2b for a highly trusted clan)
Doing legit is not worth it at all.. seeing as most people will pay 2x, and odds of winning/losing are 50/50. If anything i would suggest something similar to flower duels