I don't think banking should be paid as highly as it does, but mine workers earn so much because they literally risk their lives at work.
The reason why bankers earn so much probably is because they work with huge amounts of money, so it's easier for them to demand a cut of it.
I don't think that the money that an industry gets represents it's value to society, not even close. I don't think that a CEO brings 1000 times more value than a normal worker.
What I really see happening is that every industry tries to take as much of everyones money as they can and if they are in a position where they can force us to do it, they will.
There is no fair wage distribution, not even among white men.
Women earning less money is just one of the symptoms in this ever more broken system where big corporations control more and more of our everyday lives.