Something like 30 dollars for a residential connection, followed by 2.5 cents per GB for the first 1024 GB, and then increased to say 4 cents per GB for another 1024 GB.
If you use 1 TB, you pay 30+0.025*1024 ~ 55 dollars.
Why should we subsidize those who download tens or hundreds of TBs?
No one thinks this is unreasonable for electricity, why is it unreasonable for data? Bandwidth issues affect data too.