The risk vs reward is simply to attractive to ignore. A conservative estimate of where the MMS price will go should the coalition win (high probability at this stage) is $13-$14 / share. ~50% gain at the current price.
sportsbet odds are: coalition 1.21 and Labor 4.50. A few days ago Labor were at 4.00.
Putting Labors chances of winning at around 20% and Coalition 80%.
Worth the risk considering the short term reward IMO