Anything above DT2 is a huge network. It's like LinkedIn 3rd and more connection. Almost everyone is included into the network so there are no point for anything above DT2.
My fear about the trust system which is in accordance with 1miau: If a group of scammers upto 50 persons are working together and one among the 50 gets a positive trust. He can in turn trust the remaining 49 scam users and they inturn trust one another. Then, the trust system would be compromised.
With the current net score which is just one inclusion (then maintain the score 0) to be in the DT2 is too easy. A bad DT1 member can make as many DT2 members as he wants.
We already have a discussion and most of us consider we should have a net inclusion of above 1. Higher the number of net score is safer for the system. I personally would consider anything above or equal to 3.