Tooheys Extra dry is favoured by young drinkers because its soft drink properties. Extra dry is a very bubbly beer allowing new beer drinkers and teenagers alike to get easily sloshed on beer.
However as these drinkers get older and figure out this beer tastes bad, but having started off on a beer that is better tasting than vic or new, they tend to move onto the "premium" beers like coopers pale ale, becks, stella artois etc.