Maybe some subconscious aversion to using the colour of national sports teams? *shrugs*
Mind you, there's precious few teams here in New Zealand that wear green - aside from teams that represent Manawatu province (traditional colours green & white).
Yeah could be the national thing. Not many colours match “well” with green, yellow/gold is one but yes that’s our national team colours. White goes with everything so could def be a colour scheme to be used.
American teams have plenty. Eg NFL have;
Packers - Green/Yellow
Jets - Green / White
Eagles - Green / Silver / Black
Seahawks - Green / Blue / White