DonGould:surfisup1000: A single highrise apartment building with 300 apartments is going to be cheaper to service from an ISP's perspective than 300 single level houses spread across an entire block.
You're not making any sense.
Are you talking about the ISP/RSP or the CAN owner/maintainer?
If you're talking about Chorus specifically, then I don't see why 300 apartments are any less expensive than 300 single level homes. I could see why 300 apartments would in fact be more expensive to maintain and or make moves and changes in.
With respect to CAN maintenance, where are you assuming the costs are?
Just like in a house, the wiring within the building is the building owner's responsibility and therefore doesn't affect the service provider. The service provider's costs that would differ between MDU and house are the distance-dependent costs and the access points costs - lower per customer for MDU/apartment.