The wholesale costs of transferring a gigabyte of data are (worst case, buying 2Gbps or more of transit) about 1-2 cents. This is the very most that any vendor

The wholesale costs of transferring a gigabyte of data are (worst case, buying 2Gbps or more of transit) about 1-2 cents. This is the very most that any vendor pays, and they probably pay far far less than that. For storage costs, you could take the storage capacity of a 2TB drive, triple the cost to account for servers, RAID and other overhead, then come up with a per-GB charge per year (drives aren't replaced every year, but then there are power/cooling and other costs). So a 2TB drive is say $200, triple that is $600, say 1800GB formatted divided by $600 = 33 cents per GB per year.