No one knows lot of players go on that it will be cheaper then 90c per mil, however only time will tell.
A few incluidng myself players, and users sythe think that gold will be around the $1-2 per mil.
If your buying from trusted selller you will pay for the almost 100% that you will get the gold you brought, where players with little to no "vouchers" (or sadly lot of people see post count as a trust bar (least post - lower trust) where in fact that has little to do with it.) Will sell mills extremly cheap with some been scammers.
Only time will tell ":_)