Re: There are more levels than that
The attractions of Munich, as a base for a Hi-tech business are considerable.
Forget the Oktoberfest, Munich is one of the most cultural cities in Germany, it has great elegance, good schools, including a choice of international schools, universities that teach degree courses in English. The night life is varied, and safe, it has an invigorating climate, and is a terrific base for outdoor pursuits and exploring Europe.
As far as start-ups are concerned, it is already one of Europe's most important research and hi-tech hubs. The sorts of services required by start-ups are on the door step. Direct connections to London, Boston, Atlanta, San Francisco, Los Angeles, Singapore and most other tech centres are plentiful, unlike Berlin (which can't even build itself an airport).
As an enviably pleasant place to live, property prices are higher than say, Berlin,which is a reflection on the comparative desirability and convenience of the two cities. To put it into context, on German reunification, a number of businesses and institution refused to move back to Berlin, despite government pressure for them to do so.
I never had any issues with bank/debit/credit cards in Germany. But then credit card debt is dumb debt, so perhaps the Germans know a thing or two about the matter. If one is not a natural planner and budgeter, then expect to be regarded as irresponsible. Cautious and thrifty German habits are easily acquired. Cash is king, use that to your advantage.