There's (relatively) lots of water in the Barossa Valley and it's worth growing a thirsty high value crop like grapes there. And even there the cost structure you say is unsupportable.

But the economics of farming in the Eyre Peninsula is quite different and they really have a water problem. From a food PoV these are the people we really need to help.

(I have family in both, not to mention in laws in Germany who also have a water problem...getting rid of it!)