You clearly don't understand investment banking at all if you think most of it is betting, which I presume is your way of saying buying/selling stocks, commodities etc the way those firms do in films like Wall Street etc. That's trading which is a subsection of IB. Investment banking is on the whole very varied and is very important to the running of the financial system. They deal with things like underwriting IPOs, debt raising for business / dealing bonds (like getting a mortgage but on a larger scale), dealing with mergers and acquisitions and more. It's crucial to the running of our society today, especially for large businesses, and it's very very false to say the world could've done without for the past 100 years. It exists because there's a need for it. I understand it's fashionable to say 'let's bash bankers', but without understanding what IB actually is it justs comes across as uninformed.
On the rest, idk maybe I'm confusing you with another Bayern supporter, but I'm fairly sure you're the poster who's very pro-German in both footballing threads and in this section. I'm just calling you out on it. But likewise as a Brit I care about the UK, I guess it's natural to be nationalistic. It's just a bit grating reading this thread when it's the same 4-5 pro-EU posters posting over and over again in a derogatory manner towards the UK in a thread that they themselves say is more important to the UK then the EU. Case in point, one of my earlier posts received a reply from 4 people saying the same thing and I'm fairly sure they all quoted me the last time I posted in this thread about 6 months ago. The circle wank is just a bit annoying really.