I think faking your address in order to buy from the other marketplaces is the shady part.
Whether or not bans are incoming for that is unknown.
I highly doubt just switching your location to NZ and playing Destiny early will result in a ban though.
I bought mine with USA set as my location (Where i'm from), but switched my location to NZ before downloading the game so I still paid whatever I'm supposed to as a USA resident.
Current screen is:
Should work, we'll see.