I'm no expert on this whole home brew thing, but how much are you saving on making your own beer instead of buying a $35 carton of cheap fart Aussie beer?
I do a double brew for a 50 lt keg, so for about $40- $60 (depending what kind I do) I get about 125 worth (5.2 cartons) of 375mL beers.
For example though, at the moment I have a corona style one on and say it cost $60 for ingredients, but stubbies of those are only 330mL so you'd get about 142 of those (almost 6 cartons worth).
Only takes less than 2 weeks to be ready from go to whoa so plenty of ice cold beer on tap 24/7