COD Black Ops 2 $120 on Steam...

$120 New Zealand dollars, That is.
So I'm kinda sick of this thing that Steam does with New Zealand and Australia having these games at screwed up prices. Its not the fact that I want Black Ops 2, its the fact that a lot of these AAA games are at these prices. And yes I know I'm the Billionth Kiwi and/or Aussie who has posted this, but we are just gonna keep on whining until they fix it.
I do love Steam a lot and I'm aware main retailers have Black Ops 2 for something like $150(NZD), no I'm not kidding and I wish I was... And yes I'm aware of sites like NZGAMESHOP etc, that sell Black Ops of half of that price, I'd just wish Steam would fix this, or at the very least give us a reason why??? And yes I'm aware of The Extra Credits Episode where they answer this, but they don't, they say something about the currency??? It doesn't give me a definitive answer, so Steam why not answer this cause your support line isn't, instead of making games for the MAC?