Ok. What ROI advantage do those states offer over nz2?
Are you honestly saying teams in those states couldn't produce a better ROI than a side in either Wellington, Christchurch, or one of the even smaller cities in NZ? Really?
Depending on the timescale we're talking about, and the amount the NRL is willing to invest into it up front, WA, SA, and VIC are all capable of producing similar amounts of talent as regions of NZ like Wellington or Canterbury.
Obviously starting from the low base that they are that won't happen overnight, maybe not even in some of our lifetimes, but that doesn't mean that it isn't a worthwhile endeavour, just like the fact that NZ sides commercial ceilings are likely to be lower than those of teams in the major metros in Australia doesn't mean that they aren't worthwhile either.