As a Football loving Aucklander, I have supported Wellington as the home of NZ Football and backed the qualifier being played their to the hilt as I would rather travel to somewhere where it would be done well.
In this case the argument is slightly negated by the fact that only 500 people can see the trophy personally (which is the real tragedy here) Even though the Knights crowds where abysmal, they at least served to prove that we can muster more than 500 genuine Football fans (heck I'd love to know the actual numbers of Aucklanders that travelled to Wellington for the qualifier and nix playoff games) so in this case demand will exceed the (pitiful) supply. In fact, Auckland will have to work dam hard for this one to flop

Anyway, the point I am getting to is that the limited public access proves that this is a glorified press junket, not a chance for the people to connect with the cup. 500 in that case is a good number for that purpose, the event will always look busy but not too big to manage and 500 should provide the right assortment of mixed races/ ages/ etc for the montages/ photo galleries.
Since Auckland is where the bulk of the nation's media is situated, it is the best city for the cup to be based in for the trip to successfully complete it's mission of buying an extra newspaper column and another minute and a half on the news.
You can argue until you're blue in the face who deserves it the most but unless they change the motivation behind the visit I think that whoever chose the location has it right in this case.