I remember seeing a DW documentary a couple of years ago about how differently billionaires behave in Germany compared to the US ("The discreet lives of the super rich" was its name apparently). If one accepts the basic premise of the documentary (that the German billionaires avoid flaunting their wealth and strive to maintain privacy), it might explain why billionaires in Germany could live their lives without security while it would be unthinkable for their American counterparts.