It seems to me 3rd party security audits / pen tests do nothing but upset the internal security guy and typically cost a fair few $$ to address the weaknesses. Whereas they are crucial, I suspect not all directors of companies love to see a pen test in their diary.
But, in terms of infrastructure, operations, policy, apps - if you were a network admin or director of It for a company, where could you use your auditors to look at areas that could save the business money, or to benefit the company as opposed to find flaws that will cost money? What types of audits save companies money as opposed to cost companies money? Any pointers?