Exactly Capt Marv, thinking of the issue unselfishly...by delaying the flight waiting for 1 or 2 makes the other 170 odd (full) people late - maybe one of them has to "give $5,000 to the county clerk by 5pm or the orphanage is closed" (blues brothers fans).
Jetstar also run some flights very close to the SYD curfew to the extent that a couple of 15 minute delays during the day can lead to a cancelled or diverted flight.
Zarg, it's not all about YOU and only you.
By the way did you pay $ 49 a ticket? What's the bus fare SYD to MCY?