1) "Anti-gay" Republicans can pay for male prostitutes anonymously.
2) Donations to campaigns can be hidden.
3) Oil Companies can buy congressmen more easily and with less public knowledge or interference.
4) The Pentagon can "unaccount for a.k.a. lose" billions of dollars more efficiantly.
5) Total National Deficit can be hidden.

Added 2 more:

6) The wealthy no longer need a swiss bank account.
7) "Tax cuts" for everyone! Yay!