Apparently that 6GB listed is for their free preview packages only. If you have a the paid Home package as I have, you get 500GB of bandwidth per month. Here is their email reply to me:

Quote - Thank you for contacting us. I double checked. The 6 GB applies to free preview packages only. I am showing on your package you have the 500 GB. If you have any further questions do not hesitate to contact us. -- Sincerely Jim Reitnour Billing Department 1&1 Internet Inc.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi