A Banking Fee is a consideration that you pay to your Bank in exchange for giving said Bank the privilege of getting rich off of your money.
It takes money to make money. This is a well-known and indisputable fact. Unfortunately it only applies to people who have more money than you. Since you don't have enough money to make more money, you give it to a bank, which will combine your pitiful amount of money with many other peoples' pitiful amounts of money until the Bank has amassed a shit-ton of money, which they then use to make more shit-tons of money.
The metric shit-ton is worth slightly more than the American shit-ton.
In the future you will pay your banking fees as directed and not call into question their validity by reading about them on the internet.