It needn’t necessarily in any one instance any more than drinking must cause a car accident. But giving out more gold than you are getting is going to cause trouble in the long run. Buying that German beer, you should hope you’re selling at least as much to Germany if you want the relationship to be sustainable.
I pay a heck of a lot more to my landlord than I get in return. Is our relationship sustainable? Or should I buy some land that I cannot afford?
I'm not "giving out my gold", I'm exchanging it for beer. My beer purchases are much less than my annual income. Have been for many years.
Buying that German beer, you should hope you’re selling at least as much to Germany if you want the relationship to be sustainable.
No, don't sell a thing to Germany. Don't sell anything to my phone company or Commonwealth Edison either.