I would pay a bit extra and fly from SY
But how much extra? I'll give you an example.....in early Sept 22 a one way ticket from Canberra to Brisbane was ~$400-500....or I could catch the bus to Sydney for $50 and fly with Rex for $150. Thats $200-$300 saving for 3 hours of my time. The Murrays buses from Canberra are choka block full most days and they leave every hour and drop you right out the front of DOM/INT at Syd.
Point being, there is a price point where people will travel via other options. If there was a cheap and regular bus service to NTL and you could save $200-300 every time you flew.....you would go to NTL.