Let's not underestimate the power that Parker and Barry hold here, either. The South Aucklander, who turned professional only four years ago, is the one risking his health by getting in the ring, so it's only fair that his promoters wear a risk of their own. Dean Lonergan and David Higgins pay the bills, but the increasingly formidable partnership of Parker and Barry would have made a compelling case to hold the fight in Auckland.
Home advantage for any fight is important; for a world title fight it is gold. The three judges and referee will be neutrals appointed by the WBO, but they will be human and potentially susceptible to the crowd's excitement should Parker land anything resembling a solid punch.
Should the fight go all 12 rounds, and that's entirely possible given the toughness of the undefeated Ruiz, then that "persuasion" from the crowd could be crucial in a decision.
And that's without going into the lift the crowd support will provide Parker while simultaneously weighing on Ruiz, and the fact that the Mexican-American has fought outside Mexico or the USA only twice in 29 bouts - both times in the Chinese resort territory of Macao.
Parker is already familiar with the hotel he stays in while in Auckland, his gym, the route for his morning runs. Ruiz will be treated well during his time here but he clearly is at a disadvantage as soon as he gets on the plane.
This will probably be Parker's last fight of this magnitude in Auckland. Bigger paydays await him and Duco in Las Vegas and London. Realistically, there was only one place it could be held - now it's up to Aucklanders and fans to support it.