Maybe $2 sounds insignificant. However I know many people who now shop at Safeway just so they can get that $2 discount.
I am in Victoria, there are plenty of outlets here, they are usually full, never seen one without someone filling up.
What a brilliant strategy it has been for Woolies, for $2 Woolworths are buying the profit they are making off you spending $20+ at the supermarket. No wonder Coles are scrambling.