There's a few ways that increased data utilisation on the network is assisting their yields, but you're right that it would be relatively small. Perhaps they're using this as a platform to get more customers on the fibre bandwagon? Be quick, you're missing out!
The managed connections with higher CIR's are much better yielding, judging by the current costs being charged, and increased congestion from household traffic will probably assist those yields. Chorus can also assist in multicast solutions for video delivery etc. so there's a other ways that they can derive revenue from the network, potentially outside of the highly regulated framework. This is much the same way lines companies are attempting to extract additional value from their businesses.
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