Following an Age story about the continuing debacle that is Myki, this eminently sensible suggestion in the comments:
Simple solution, make it free and avoid all this Bultish.
Every taxpayer dollar spent on ticket thugs – sorry, “inspectors” – is a wasted dollar. At least that dollar going towards getting people off the roads and onto a train would actually be achieving something.
Other cities have managed it.
At the very least, lower the fares so public transport users aren’t paying more for leaving the car at home.
UPDATE: Wikipedia has a more expansive list of zero-fare cities here.