Generally, we don't get the same level of import talent in the NZNBL as the NBL. With that being said, there have been quite a few imports who have played in both leagues (Crowe, Wethers, Braswell, Rickert, Tucker, Andrew Warren, Maxey, Pace, Conklin etc.)
I think the NZNBL punches way above its weight in terms of attracting quality imports.
One advantage may be the length of the season.
Season starts April and finishes in June.
3 month season, and teams often allow imports to come in only a month or even a few weeks before the season.
So they can come here and the pay is very good when you average it out to 4 months work.
ANBL season goes from October to April (7 months), throw in the fact that imports may have to come out 2 or so months before the season, and it effectively means they are working for 9 months. Which could prevent them getting other deals during the year.