Salaries are *low* in NZ.
Salaries in isolation means nothing unless you're saving up for living somewhere else. Cost of living in NZ is relatively low.
I'm not sure I agree with this. Housing is expensive, maybe not as bad as some places but there's a housing bubble right now. Finding rental properties can be difficult - according to the news paper 40 people looked at one rental recently. Anything from overseas often has multiple margins added as it goes through multiple distributors, or if you import it yourself shipping fees can be high and the government charges tax and sometimes duties. Food is cheaper in the UK and the USA - sometimes it's cheaper to buy NZ products like cheese and meat overseas than in NZ.