They cater for the malcontents in society that meander from one right wing nationalistic group to another. As one folds the shift to the next. These minorities exist all the time and usually are motivated by singular issues and usually have a component of fear. Currently they are fearful of Muslims, previously it was Asians and the perennial they go back to whenever they get the chance is to complain about our indigenous Australians.
They don’t tend to be well educated and if they do get an educated one in their Party ranks its someone who uses the un-educated supporters for their own advantage to get elected and receive a fat Senators pay and associated perks. Its a repetitive cycle.