But as more Australians vote before polling day, the democracy sausage tradition could be on borrowed time.

Queensland University of Technology adjunct professor John Mickel warned seats like McConnel, where about 35,000 voters have already cast their ballots, Cairns with 20,586 and Hervey Bay with 21,746, shouldn't bother turning on the barbecue.

"In McConnell ... if you're setting up a sausage sizzle there on Saturday, don't bother - you will be losing money," he told AAP.

With the stark rise in early voting, Premier Steven Miles made his first commitment in days by promising democracy sausages at pre-poll booths if Labor wins a fourth term.

"An important reform to democracy that I would like to see would be democracy sausages at pre-poll," he told reporters outside Nambour Hospital on Thursday.

"I commit to Queenslanders to work as hard as I can to ensure that there are sausages at pre-polls.

"Not sure how to do it for postal votes, but we'll work on that."

Some 690,000 postal votes have already been processed ahead of Saturday's poll.

Almost 19,000 votes have been cast in Opposition Leader David Crisafulli's electorate of Broadwater on the Gold Coast.

But all is not lost for those who enjoy a snag served with bread, sauce, onions and a smile.

"In some places, there's still plenty of sausages to die in the name of democracy," Prof Mickel said.

With AAP.Image: AAP