At least we get a fairly faithful version of BUL beers in Australia, by contrast in the UK when they started brewing Fosters locally the first thing they did was drop it to 4% ABV - it tastes nothing like an Australian beer and I expect they would use English or Euro hops as well. The awful UK versions of Heineken etc are also gruesome. If M^B is correct and the only people drinking Peroni and Grolsch around the bars are just posers then they will be none the wiser about being ripped off.
However I can see the brewers getting into a spot of trouble entirely of their own making. By expanding their portfolio into exotic stuff in the hope of attracting a more sophisticated drinker they are actually exposing more and more people - especially younger drinkers - to different styles and tastes. For example in Chinatown on Saturday night you'll never see a VB or a Crownie on the outdoor dining tables - it's nearly always a Fat Yak or a JS plus of course the usual Blond Blonde Dry BBllloonde etc etc, but tastes are certainly on the change.
Away from the restaurant and at Dans the new drinkers are twigging that a carton of Oettinger or Konig Pils or Bitburger is only half of a BUL.
These beers are not imported by the Breweries, they are imported by Coles and Woolies etc (not exclusively, I bought a carton of Urquell for $40 from an independant in Sydney last year) so the Breweries betta watch their backs.