JetGo are on the ball, and has been pointed out, there is a lot of mining development out and around Roma, with more to come. A lot of miners and mining executives live in Sydney, and prefer Sydney over Brisbane. If you were a miner why drive from your mine to Roma, then catch a flight from Roma to Toowoomba, and then drive back to Brisbane from Toowoomba in gridlock? Instead, drive from your mine site into Roma and catch a nice comfy Embraer from Roma direct to Sydney.
Sounds logical