I'm wondering what the logistics of this would be. Say 1 customer is storing 100GB in a cloud storage service that does internal de-duping. A second customer uploads exactly the same 100GB of data. What is each charged? The whole 100GB*rate? Does each customer pay half? Do prices change for remaining customers when one "copy" of the data is removed? Without charging each customer for their total apparent storage use, I don't see how any customer can have any predictability as to their monthly bill.