How could using Torah to make money be ok? One is not allowed to learn Torah for money, nor teach for money. מה אני בחינם אף אתם בחינם THE gemara brings down that God says: "Just as I taught Torah [to Moses] for free, you also must teach Torah for free." Maybe a rav was brought in in order to make decision about law? But that can not be so either, כל דיין שנוטל שכר לדון כל דיניו בטילים "Any judge to receives money to judge, all his decisions are invalid."