Quoted from vid1900:If you never get married, and never knock any broads up - you will save, on average, $280,000 per child you don't have to support to the age of 18.
Then think of the additional savings when they don't move back into the basement, as 58% of them do, after college.....
Your post just prompted me to look up the Australian statistics. I just discolvered a study done over 4 years ago here in Australia estimated the cost to raise a child to adulthood was $406,000 per child for the typical family. That was 4 years ago. With inflation and other recent cost of living factors, it would now be near $450,000 per child. That is assuming you don't send your child to private school. If so, those figures skyrocket to around $580,000 per child. (And that is not even the prestigious private schools - It is all guess work after that, but it would be a great deal more.)
Can you believe those figures! Having a 5 year old myself, it is no wonder I can't afford my own pinball collection. I'll just have to content myself with hunting down location machines as often as possible. Maybe one day when I am old and grey. 
