The other benefit of utilising these types of fares is that they can really jack up the SP per dollar earn.

If I wanted to go AKL-SIN in J, at their current sale price this would cost $3,085 (one-way) and earn 178 SP, so $17.33/SP.

If I wanted to be savvy, I could, like the discussion upthread, go AKL-SIN-HAN with a long stop in SIN. This would cost me $2,721 one-way and earn 238 SP, so $11.43/SP - a 34% better value.

This tends to work out great for me as I travel to SIN and SEA regularly, and SIN is an allowable stopover for most (if not all) of Air NZ's marketed SEA destinations they do not fly directly to.