Earlier quoted context omitted.
What I don't understand is the need for multiple credit cards. I have a bank card (an EC-card) and I haven't used my credit-card since a month (other than automatic transactions).
Why would you ever use a EC card instead of a credit card? Credit card companies literally pay you to use their cards. Why turn down that money? I carry two credit cards because one is American Express and pays me more but fewer places accept it, so I have a backup Visa that pays me a bit less but everywhere accepts it.
Americans never believe this until they've made a frantic run to an ATM after hosting a big dinner out or when they want to check out of that charming Gasthaus in a ski town.
When I first got over here in 2004, Media Markt (large electronics chain) didn't take credit cards, but did take EC-cards.