With their current promotion, business class fares from AKL to AMS return are around $NZ5700. Plus I earn Enrich miles.
If I log in to my Enrich account (I have about 11,000 miles) and do a dummy booking on the same flights, on the same days, using my points in Enrich's Cash plus Miles deal, the cost jumps to over $NZ8000, and I use up my points, gaining no new ones.
This makes no sense, and probably is a good reason to look elsewhere for flights.