SBS | Marriage plebiscite study 'skewed': Abetz claims SBS New research suggests a stand-alone plebiscite on gay marriage would cost half a billion dollars. (AAP). File photo. (AAP). New research suggests a stand-alone plebiscite on gay marriage would cost half a billion dollars. (AAP). New research suggests a ... PricewaterhouseCoopers can count on same-sex cause Gay marriage: Plebiscite to cost $525m, will 'expose people to hate' Marriage plebiscite study 'skewed': Abetz |