He still has to worry about the bottom line. He gets paid a salary and would certainly benefit from registrations in .nz even if a non-profit. Non-profit revenues pays his salary. No different then the head of PBS saying why pbs is superior to non-public tv.
Actually he doesn't. Vikram is CEO of Internet NZ* which outsources running of the domain to NZ Registry Services and administering to DNC. Each of these has a board and a CEO. It's a pretty clever system, which came about because of some issues about 10 years ago whihc saw the whole thing almost go off the rails. It's now seen, I'm told, as best practice.
Revenues from NZRS are more than sufficient to pay Vikram's salary, and that of his staff, and InternetNZ has a decent warchest to keep doing so for quite some time. Check the website - all the accounts are published.
*I'm an elected Councillor for InternetNZ. We at internetNZ worry most about ensuring we have an "open and uncapturable" internet in NZ. This takeover of .com domains is an important issue for us all.