http://www.zdnet.com/au/nbn-to-save-up-to-au700m-in-copper-maintenance-costs-7000002846/

Add inflation of 3%, times this by 30 and you get....

20.3 billion - add this to the cost of the coalitions plan (20-30 billion) and what do we have

50 billion over 30 years!

Of course the nbn is more expensive than the nobn!