> Bandwidth is dirt cheap outside of the Cloud
Enterprise level network equipment and infrastructure are extremely expensive. Unusually cheap BW rate usually means cheap equipment or over-subscription or not enough qualified support personnel. And in some cases under-selling to get penetration to a market.
The reason Google Fiber can sell cheaply because (AFAIK), in almost every town or cities that they deployed their network they negotiated special deals with municipalities or equivalent entity to get free access to existing infrastructure or get special deals. There is a reason why Google Fibre is not everywhere or they are not pushing it very aggressively. Because building networks are freaking expensive even for google.
BW may not have any value but building the network and maintaining it to serve you BW is expensive. Your BW cost is a reflection of the cost of your network.
Disclaimer: I own an ISP.