Just on this, it's extremely hard for unestablished political parties to get established in NZ. I think a thing we constantly need to be conscious of, though, is the possibility of existing established parties being infiltrated and redirected from within.
Several major parties this election have list candidates who'd not look out of place in some of the much more fringe parties. It's not as if we haven't had fringe candidates enter Parliament previously via existing parties, and they have tended to be either controlled from the top down or ejected, but those groups are getting more organised and aren't as stupid as some people like to think.
If the US is anything to go by, they started with school boards and local politics which often have lower turnout and less attention. Since then, one of the two major political parties has effectively been usurped and reshaped by people who'd simply not have had a significant place in political life two or three decades ago.
My thoughts too. From memory sales of double cab utes also surged immediately before and plummeted immediately after the prices went up as expected due to their high emissions.