People are trying to sell their forms for the government's same-sex marriage survey on online marketplaces like eBay and Gumtree, the day after the High Court gave the green light for the survey to go ahead.

Zaky Mallah — a former terror suspect who was briefly the subject of national controversy after appearing on Q&A wearing a marijuana leaf hat and accusing politician Steve Ciobo of encouraging young Muslims to go to Syria and fight for ISIS — listed his survey form on Gumtree for $600.

The forms will not be posted out until September 12, and are due back by November 7.

Mallah told BuzzFeed News he was selling the form "out of respect for both sides".

"I love my straight and gay friends equally. So I'm sitting on the fence with this one. Hence, the paper is up for grabs," he said.

Asked if it had occurred to him that some might not regard selling the form as particularly respectful, Mallah said: "I really don't care what people think".