Centaurus,
You will find that Avalon Airport charges for all approaches made to its runway. This includes ILS, GPS missed approaches, overshoots etc. Each individual approach made will be chaged at half the price of the landing fee.
Some training companies have estbalished an contract agreement with Avalon Airport so that they do not incur multiple landing fees whilst using Avalon.
You are correct that Airservices Australia own the VOR and NDB's servicing Avalon however this is currently changing which is why the airport is charging for their use.
Skip Fulton
OzFlight.com.au