Security, Privacy, Trust, Identity Protection, Auditing
How do you know who you're dealing with? Who says they are what they say they are?
When dealing with large sums of cash and people you don't really know - it may become necessary to hire specialists in protecting not only your financial assets - but you "paper trail" as well - especially if the paper is electronic.
Theses services may be required by any member of the project - including the technical and business resource people.