The main airport costs will be the large end user ie Gold Coast or Cairns, who really won't give a dam about doing deals unless you are shuffling a lot of airframes in and out, one flight a day at minimum cots you will get shafted to freight apron with a container for check in, and still pay more than what QF do.
Airports are wary of LCCs because they are here today, gone tomorrow. They are loath to provide infrastructure because the LCC will want everything, but want to pay nothing. LCCs also bring LCC problems, like LCC passengers, lowest tender GHAs, minimal staffing (if any) when things go wrong, etc.