First, let me state that contrary to what most people expect, banks are horrible at managing money, especially their own. If you're not like an investment banker, you get paid as little as possible. They only pay you if they are desperate, with the primary example being COBOL programmers.
Second, "banker" as a job title doesn't mean anything in Germany. There are multiple educational paths in Germany, with a lot of them not coming from college/university, but by training: Bankkaufmann -> Bankbetriebswirt or Bankfachwirt.
They all get paid from 2.000€ to 3.000€.
Those usually take the path training -> further education, and in Germany it's viewed on the level of a plumber. If you didn't go to a proper university for a at least a Bachelor degree you're not viewed as coming from an academic background, so you're not worth that much money. Germany has this work culture of "you need a piece of paper to prove your worth."
If you don't have that paper you're pretty fucked. How fucked? If you're in any regulated craft business (e.g. car repair) you need a certificate ("
Meisterbrief"), or else you're not allowed to run a business in that field ("Meisterzwang"). Oh, any you need to be a member of the chamber of commerce and industry ("Industrie- und Handelskammer"). A paying member, of course.
Also, the most critical thing here is probably that in German law all bankruptcy cases go to court and involve lawyers and notaries. And those jobs take all the money.