Marcia Mikhael, 43, was one of 17 people taken hostage at the Lindt cafe in December.

She featured prominently during the siege, issuing gunman Man Haron Monis' demands via YouTube, Facebook and a telephone conversation with Channel Nine's Mark Burrows.

She was shot in the leg during the 16-hour siege.

Monis' demands included that an IS flag be sent in exchange for one hostage and that the media be alerted that the siege was a terrorist attack.

In exchange for five hostages, Monis demanded contact with Prime Minister Tony Abbott.

Ms Mikhael received an undisclosed sum for the Channel Seven interview, which is to air early next month.

But media organisations will be able to bid for opportunities to interview her 10 days after the program airs.

Earlier Jason Arraj, Ms Mikhael's lawyer, had reportedly demanded a six-figure sum for interviews, News Corp reported.

Mr Arraj, who is also related to her, said she would use money from media interviews to set up a foundation to help the siege victims and families of those who died.

"It's to assist the victims of the siege for their mental illness and to assist the family of the deceased who were in the siege," Mr Arraj said.

He was unable to disclose more details as he said Ms Mikhael was still recovering.

"She's still suffering," he said. "She's had two surgeries, she's still got shrapnel in her legs, she doesn't sleep at night due to her flashbacks."

Ms Mikahel is on leave from her job as a Westpac project manager.

"Nearly everyone has done an interview with various TV stations, so to single her out is cruel," Mr Arraj said.

Ms Mikhael's foundation, if established, would be the second foundation to be set up, after the Katrina Dawson Foundation, which will focus on the education of women. Former governor-general Quentin Bryce will be its founding member.

Bali Bombing Survivor Peter Hughes talking to Radio 2UE's Justin Smith when asked if Marcia should get money for her story

"So she should, she should get every dollar she can as best as possible because at the end of the day that person is going to have to live with this for the rest of her life, she's going to have to live with that injury she's marked with for the rest of her life. No amount of money can change what that person will be going through, but at least it's going to help.

"This person will need it. Her family will need it, her friends will need it.

"At least she can move forward with something because most people that go through trauma don't get as much help.

"I wish her the best and I hope she gets as much as she can.

"What they did for 911 and Mumbai and Bali Bombing and Jakarta, they averaged it out at 75 for the people that lost loved ones so that family should get 75 thousand for the loss of loved ones.

"To the more critically injured and probably more traumatised, they should get the same amount. And the people that probably didn't suffer as much, they should probably get a percentage of what that might be, of the 75 000.

"I don't know where that figure is from, that's obviously a state government thing but every state has got a different level in terms of victim compensation.

"Tony Abbott, the Prime Minister, is very sympathetic to this, he pushed it really hard, he made a point when we were working together, that 'I will definitely put that through once I become Prime Minister' and he did that.

"I think if you put the question to the Prime Minister he'll look at it favourably and do something about it in some way or form.

"He's just a brilliant man when it comes to those sort of things with Australians who get caught up in a bad situation.

"They're going through hell, there's no question about that.

"They'll get all the care from, whether it be the state government or the federal government.

"They will be looked after don't you worry but they'll never get over this trauma, it just takes forever. If you asked me that question 12 years on from Bali it's still the same. It's just a hard one to get over and you just get on with it day by day and most of these people that go through these traumas, they're bloody brilliant people, because they don't show the pain. They put the mask on and get on with it.

"I have my bad days.

"I watched that Martin Place siege and it just broke my heart.

"It just reminds you that we all have to be vigilant."