I found the cost of installing ILS in the US a while back. I forget the number, but I think it was less than 1/5 the cost in Australia. Same hardware. Same installation process. The difference is AsA's charges. One day we need to get to examining what is really going on there. I'm sure the money is not going in controllers wages.
Wagga to get ILS - Australian Flying
According to this article, $1.6m from scratch. If done in bulk, the economy of scale would easily get it down to $1m per installation.
Given CASA have so far spent $300m on regulatory reform (mainly that Part 61 piece of crap), we could have had 300 ILS installed all over the country. Which would provide a better safety benefit I wonder?