Well, to be honest, we did make a lot of money being in the EU. The problem is, Greek and other Southern European countries are just not competitive enough, even against our relatively high wages. German engineering is second to none and our products are loved and admired worldwide, even Japanese snops have to give in, when they see a Porsche or BMW.
On the other hand wages in Germany have been stagnating since the introduction of the Euro in order to remain competitive as neither we cannot intervene in the value of the Euro. Germany raised the productivity at the same time capped wage growth, the other raised their wages without raising the productivity. We also lent them a lot of money to buy our products, but the profit was not redistributed to the workers. We are somehow in a similar but worse situation than the Chinese. They too lent a huge amount of money to the US to buy Chinese products, but at least their wages has been rising steadily and they are less dependent on export as we do (over 30% of GDP).