It is true that we don’t have any pre-packaged accounts with more traffic or storage than the Premium accounts 500GB storage and 500GB transfer. For customers requiring more, we have the Custom account:
A custom account is a Premium account with added storage AND/OR transfer.
Traffic or Storage is added in chunks of 500 GB, streaming prices
So, for an account with 1TB (1000 GB) transfer a Premium Account + a 500 GB custom transfer addition is needed. This way we can offer streaming and storage to really low prices, but still tailored to your needs.