Mr Smith.
I want to know what service or information a UNICOM can, or will, provide.
I do not want a service that is dependent on who turns-up, or how busy they are, or how they feel, when I request their services.
The USA has a heck of a lot of small airports, and their business model is to get fliers on the ground to use their services.,
ie. if outer-ButtFf airport provides a better UNICOM service than inner-ButtFf airport then there is commercial pressure for the inner-ButtFf UNICOM to improve their service to get more customers.
Australia simply does NOT have the population, or the number of aircraft, or the number of airports, to provide such an 'free-market' in aviation.