There are a lot of Kiwis living on the Goldie, but generally speaking, this is not a rugby town, to put it mildly. A lot of the local retirees are from AFL regions. The local A-League franchise has bombed, as has the basketball. The Titans are just hanging in, and loig is far stronger here than rugby.
The Sevens will grow, from what I have heard, people really enjoyed the first one and of course New Zealand will dominate, as usual, so the local Keewees will be there in numbers.
All in all, I am not sure what the strategy is about. Unless there were significant kickbacks for playing at Robina, it would have been far better to play this game in Sydney, where there is presumably some sort of Argentine population. Maybe the problem is the timing, with the NRL finals taking the SFS?