If only it was that easy, I am very much an optimist when it comes to these things and I would love to see things come into the country but I have been around long enough to know how things work.
It is all about $$'s in the end, an importer would rather import 10000 neons they can get through quarantine and actually sell because they are bread and butter fish than import things that are more expensive and a higher risk. You also have to realise that in todays climate a higher risk fish (which may die of natural causes) can cost an importer big time in testing fees, extended quarantine times and maybe even an entire shipment destroyed. So it is not just these importers being tight over a few $$'s it is there livelihood and alot of money. From what I have heard about people ordering special fish they actually chew up alot of the importers time ringing and making special demands they have to justify a new tank for them and take the risk etc, again it would make better business sense to be boring and bring in some more neons. You also have to realise that alot of the overseas suppliers that deal with NZ probably don't have alot of descent fish on their lists just the more common and cheaper bread and butter fish so potentially the wholesaler might have to deal with a whole new supplier if they wanted to get different stuff in.
Just my 2c worth I would love to hear from someone in the industry about their opinion on this. My belief is there would be alot of people throwing species around but when it came to deposits coming though there would be a great disappearing act.
Edit - Alanmin posted a few things before me but I can't be bothered rewriting mine instead