RyanAir flies to satellite airports throughout Europe not principal airports.
....And as Australia doesn't HAVE satellite airports that can take an A320 (with the possible exception of Avalon), the Ryanair model copletely collapses in an Austarlain context
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Nor does New Zealand. I can't imagine Chistchurch or Auckland residents being interested in driving to Dunedin or Hamilton when their respective primary airports already have competitive prices and Palm N has its limits if you want high PAX numbers as Freedom found out.
I could imagine Tiger flying from Gold Coast to several NZ cities incl Wgn and Hamilton as a lower fare option to flights to Brisbane.