Companies with a large number of DSI-certified employees have an advantage over other firms. Your staff can be registered with the DSI foundation as DSI certified professionals. By registering, your (potential) clients know that they are aided by professionals who place a high value on integrity and expertise.
DSI has 11 certification registers for professionals, so there is certainly one for your profession. See the DSI Registers page for an overview. The fees can be found on the Certification Fees page.