MattEast: Our casual rate is currently one of the best available. It only gets better on account or with one of our prepay bundles, welcome to pretty much the only industry that has consistently dropped prices over the last five years. You get more [faster] for less.
Out of interest, what is your ideal casual data rate?
Thanks for asking, I like that Matt.
No rocket science here, and as you asked, least is best.
Moving from ideally to more realistically (I am not going to respond to all your points nor analyse this is robust detail as I have a business to run too, however) I think anything in the range of 20 to 50c per MB would stand you in good stead with the NZ marketplace - and of course the competition you provide yourself across the ditch.
Would that be so unreasonable?