From where I live (near Melbourne) I will beat you to the Gold Coast flying my 165 kt machine than if you take RPT.
By the time you:
Drive the car to Tullamarine: 45 mins
Park the car and get to the terminal: 20 mins
You'll have to be at the terminal 1.5 hours to 45 mins before your flight split the difference: 65 mins
Flight time: 90 mins
Pick up your bags at dest: 30 mins
They've got a Kingair. Whether these guys can get this point across is another thing. The Australian RPT traveller is a dunce compared to those in the US. Fractional works over there, they're not as hung up on lounges as Australians.
And all of those figures are pretty conservative. If you miss your flight on an airline, unless you are flexi fare (loads more for the fare) it's gunna cost you a small fortune, last minute, to hop on the next flight. The food in the lounges is pretty average, you can't hook into the piss if you are driving at the other end so the complimentary booze is moot. If the punter has a think about this (which 95% of them won't) there's a fair bit of sense.