I thought Cost Plus incentivise people to do unnecessary work? Since getting x% of "plus" on top of a huge messily, error filled contract is more than a lean efficient one?
I think contract organization aside. If the government says it's a requirement the vendor will charge the max it can and accomplish it no matter what. So, in practice vendors have accountants on staff that will work a contract in such a way that logistically allows the vendor to charge the most it can for the contract.