How to open this

I would like to ask everyone a question: why do they say that Binance's Super Rebate Level 1 can only return 30% of the contracts, not to mention that the maximum level can return 50%? According to logic, even if it takes a small cut, it should be about making a thin profit on a large volume, so it wouldn't be so different.
I am currently thinking of opening a new account to trade, what is the maximum rebate I can achieve? $AIA #返佣