Consider the population densities per square kilometer of countries overseas in relation to New Zealand. Consider how many more prospective customers there are available to each network carrier, how much per customer it costs the carrier to do a network roll-out and the subsequent return on investment those customers offer and then do some basic math. I'm sure the answer will become apparent eventually.
So you can hand on heart say that the profit margin on data is not higher than that of calling and texting?
all three of these items are measured differently?