Well that would still be a vote 
informal voters just drop a blank unmarked ballot paper in the box, but most just have their name crossed off and walk out.
It would be interesting to see what voter turn out would be without the mandatory system, and what changes it would bring to candidates. Overseas the voter turn out is used heavily to show how much interest the public has in policy and direction and political engagement.
Well NSW didn't have too, we are only supposed to be returning Australian Citizens, still about 40,000 to go, maybe NSW should focus on them instead.
It's funny that number has been 40,000 since March LAST year. It's stayed at 40,000 every time they mention returning Australians, so it's either a BS number or they are letting as many Aussies leave each time they bring some back. Either that or some of those overseas Australians are multiplying like rabbits in boredom.