It's about it being a criminal offense to sell a photo you have taken of all sorts of places like Sydney Harbour Bridge, the Opera House, Bondi Beach, any National Park and so on. Even if you are an enthusiast who happens down the track to have the opportunity to get an image published, or even win a prize in a competition.
This affects both pros and amateurs alike, not to mention it making it very difficult for a pro to do any sort of travel or street photography with out being pestered by council employees or having people assume you are a pedophile.
And another thing, it's really tedious for camera buffs with half decent cameras to be assumed to be pros when out following their hobby. This means they get approached all the time by over zealous officials and have to defend their rights to go about their lawful pursuits.