This is not a balanced way of looking at it. Some sections of retail are greedy if they can make it work, but they also have to work with excessive rents, and for those that are local online retailers, excessive import duties and charges, and/or local distributors who see affluent Australia as a low volume cash cow, to be milked as hard as possible before the retail margin gets put on. Retailers generally are doing it pretty tough, and expected to work longer hours for questionable gains in turnover demanded by late or Sunday trading, or find workers at excessive penalty rates to do it for them.
It's not about evil retailers, it's the whole infrastructure that shafts the lot of us. That's why overseas online has got some traction, and why the govt has decided it needs that pie back.