As anyone who has read the E-Myth by Michael Gerber will tell you the value of any business is not what the owner believes it to be worth but what someone else would pay for it. In this respect it is important that as much of the information about a business and how it does business is documented in a meaningful way.
I believe that is where a tool like Sharepoint can really assist since it is not only flexible and easy to use but it is also free. Read my recent thinking on the matter in the following document, which can also be found in the Supportweb Document Libraries.
CIAOPS 