From an economist's perspective, bankers can create value. If you want to lend money and I want to borrow, but we don't know/trust each other, a banker can "produce" a big help to match us together and price the risk. Those are two examples; there are tons of other services bankers provide their customers.

I believe bankers add value this way. To my eyes "bankers don't produce" is just as unfair as "coaches don't score any goals."