The game is at the end of January, that gives you 9 months to plan and/or save for it.
There's more options than just flying - there's ferry/car combo, ferry/train combo.
Plus there are 3 airlines flying between Wgtn and Chch.
You can make it a weekend away, a trip away will be fun for your whole family.
Think of it as a mini-away trip, without having to go to Australia.
It seems like you're saying that because the trip is too expensive for you, thousands of people in Christchurch who have never seen a game of professional football should be denied the chance?
That sounds a bit selfish to me.