I would consider that one of the least bad things the Nazis did. Every ruling clique that is not subject to oversight becomes corrupt and enriches themselves, that is almost universal.
But money was not enough in Nazi Germany, you needed power and influence. The "old guard" Nazis did often not come from wealth, they amassed it by bribes, plunder during the war and exploiting or confiscating Jewish assets. The "social" arm of the party withered after the Roehm and SA purge, but ruthless people still managed to rise in the party or SS by "merit" alone.
But of course most rich people aligned themselves with the Nazis and took up the opportunities the Holocaust and war gave them and got even richer. No one wanted to end up like Thyssen.