BlinkyBill: What's the problem with paying GST on purchases you make whilst domicile in New Zealand? Like everyone else does?
Look at the argument from the opposite perspective. If I buy a foreign-made game from a foreign service (using a foreign payment method such as PayPal, perhaps) then what has the NZ government done to deserve an extra 15% on top?
Same reason for the goods that are made overseas, and sold here. The Govt hasn't done anything to deserve those taxes either. Nor the income tax that I pay, but they collect tax to fund NZ's budget.
In any case, GST is a consumption tax, not a production tax.
i.e. the tax is based on where the purchaser is, not the seller. (with a few exceptions)