You say that a member rating is calculated from the information about the previous deals. How is the system protected from fraud? In a situation where many fake companies can be created and then order fake supplies from a fake supplier.
This scenario will not be possible, since at the stage of KYC we will have strong supervision of who is eligible to join the network.
So there is no option for fake companies joining the network.
Are you sure that you're not overdoing the protection system? It may scare off not only the fraud and scams, but also the real companies .