I've done 6 TB on Time Warner residential before so I bet I could get away with 16 TB. That's already more data than a Comcap customer is allowed to transfer in 2 years.
They really do not give a shit. Bandwidth costs these companies nothing and now that DOCSIS 3.0 has been rolled out congestion is no longer a concern either. Bandwidth capping is straight up for controlling Internet video competition only; there are no other financial reasons behind it.