It all comes down to dollars. From memory it cost 11 million just to build the fence. That's before any pest work was done. The eradication job used brodificoum which is far more detrimental to the environment than 1080 due to it's bioaccumulation. I shudder to think how much we spread up there when I was there.
On top of that you need to employ staff to maintain the fence, respond to incursions (trees fall over smash the fence, pests get in.) And you need staff to look after the re reintroductions.
Your 30 million will get you 2 Maungatautaris if you are lucky.
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