Simply having the auditor's report conveys to your prospects that you're speaking their language. But meeting their needs at every level earns and keeps a client's trust and builds "brand" with every interaction. A focus on the customer is the most powerful way of winning and keeping that customer. This sounds like a marketing talk on purpose; marketing experts understand the importance of a consistent message of excellent results. And what is an audit but proof of consistency?
It may be that when we no longer know what to do we have come to our real work, and that when we no longer know which way to go we have come to our real journey. The mind that is not baffled is not employed. The impeded stream is the one that sings.
—Wendell Berry