I did not miss that at all, I just didnt' comment on that. There is very little, I personally, can do to about the over-all water supply - which is the reasoning behind this pricing. I can be critical of how it's tiered but that's it. On the other hand - adding a rainwater harvesting system to my home is something I can do, it's a practical step I can take to help make things better - for everybody because by using more rainwater myself it means less damwater used - which means more for other people.
In the same vein I intend to start going solar over the next few years. Eventually - I would like to use only renewable energy at home, not just to save money either, but because I believe in walking the walk. 
I cannot, in good conscience, advocate these things for the country as a whole if I am not willing to do them myself.