Air NZ surely know the numbers. I am surprised though. I wouldn't have thought credit card vouchers would be rhat many people in the lounges. The spend is quite a lot, and I would have thought that those of us that get lots of them from our business spend are usually also traveling for business already and have status anyway. Last I knew I had 30+ vouchers that will literally never get used. Most people would get 2 a year, max.