surely part of the reason why the nightowl problem is still running is because the norm is to benchmark uncapped accounts to line speed - so everybody on a 1 meg account is running on a 1 meg account so your maths is built around that - whereas if Telkom benched the 4 meg line as the norm and ISPs had clients in the 1,2,4 uncapped products you could simply bring out afterhours bolt-on products to escalate on the ratchet to the higher line speed.
Not sure if I fully understand what you mean here, but we do want to incentivise clients to make use of the later hours. Not so much to make more money in terms of charging additional fees, but just to get better use out of the capacity. We pay for it anyway, so obviously we'd love to see clients getting as much bandwidth as they can. IF we can achieve that, we'll be happy to upgrade for more capacity.