Originally Posted by Erasmus III

One thing that's been missed in this conversation is that on airlines where PJs are offered, you aren't obligated to take them; it's a choice. If you want to use your own, that's fine.
Personally, I think airlines in general (and NZ specifically) are missing a trick by giving away cheap pens which only get used once to fill in the landing card and then forgotten. If they spent a little more on a quality pen (say $2 instead of 50c), frequent travellers would take them and either use them or gift them in the real world.