And that's where I find myself today. And it's a bloody expensive day. Depending on who's counting the confetti, the average cost of a wedding in Australia this year is between $36,700 (IBISWorld), and $48,296 (Bride To Be magazine).Let's call it $40,000. Of course no one sets out to spend that much-it just works out that way.nd it's a bloody expensive day. Depending on who's counting the confetti, the average cost of a wedding in Australia this year is between $36,700 (IBISWorld), and $48,296 (Bride To Be magazine). Let's call it $40,000. Of course no one sets out to spend that much-it just works out that way.