That makes it a good comparison because it makes it clear that this is about profit and not about the cost of offering a service.

2 folded plastic bags (a little worse for wear) in the coin compartment of my wallet and a string bag from PNG lurking somewhere in my backpack (this thing expands indefinitely - my ability to carry it does not)

doesn't avant garde refer to the house in that sentence?

Unless we are entering an iceage - which granted we may be - a house in Victoria, Australia is no not going to have the problem of the water icing, certainly not when the tank is internal to the house. For starters look at the insulation. It would cool the house in summer very nicely, but other than that it seems to take up a lot of room and doesn't mesh well with the architecture of the house. I am very interested to see where this leads however. I wonder if you could have some of the internal load bearing walls as water tanks? I know thats what this is attempting, but it just sits like a blob, there must be a better way of integrating tanks into the interior of the house.

The intense desire to redesign is, I am sure, precisely the response desired given the theme of this art work. It certainly makes me wish I had an abandoned rail nearby.