I am travelling to Syndey this weeked for a holiday from Brisbane. Should I get travel insurance? I have private health insurance. I don't think it is necessary. I have had travel insurance before but this was for overseas travel.
I never get travel insurance for domestic travel. My household contents insurance covers lost or stolen stuff, and my health insurance covers health problems.
One major thing that your health insurance won't cover though is problems with the airline/flight. For example, one trip from Melbourne - Gold Coast couldn't take off because of flooding on the Gold Coast. All that the airline could offer was a flight 2 days later or a credit. My travel insurance picked up the difference (about $350 extra) to change to a different airline and fly into Brisbane later that day.
Other things to consider, if you get sick while you're away or even before you are due to go and you can't fly on the day you have booked, if you don't give 24 hours notice you won't be able to change your date on discounted tickets and you then have to forfeit your ticket and buy a new one for when you are well enough. Travel insurance would cover this.
Mind you, there are many people out there who don't take insurance for domestic trips, I guess it comes down to whether you have to money to cover it if something goes wrong....