said by bt:
The prices don't include modem rental/purchase. So no, Doc2 customers aren't paying for Doc3 modems. Speeds, though - yes.
One could probably argue that DOCSIS 3.0 is cheaper than DOCSIS 2.0 for them, since I'd imagine it's impossible to buy D2 only CMTS's at this point and with D3 they have the option to use channel bonding to add more capacity to a node vs with D2 and single channel contention that they have to more often physically split the node to reduce congestion. I'd go further and say this is also why they want D2 off their network and are continuing to decertify older D2 models. It's hard to imagine that D3 profiles themselves are more expensive in a network that is already fully D3 capable. Yes the CPE's are more expensive, but this is of zero impact to the cable company.