It would be far easier to stop drivers reverse parking. Up until a couple of years ago in Victoria, it was unheard of. Now more and more seem to be doing it.
You would be surprised what people think they can return. Then they shout and make a fuss when they are rejected. That is why stores are now putting up signs about abusing the staff. What we think is common sense, is not to many 'entitled' people.
They only have home brands, and seem to be a lower quality than Coles and Woolworths. There is also the matter of having to wait in line at stores where they don't have self-serve.