"I'm from [the US] and I would have otherwise been happy to see the Cup stay here. But once I heard about how the cheating stuff was being handled and no one was taking responsibility, I said, 'Right, get me the biggest Kiwi flag you can find.' I put a stake in the ground.
"I've been telling people, if they ask me why I don't support the home team, 'Because I don't support cheaters'."
Athena has been berthed alongside Oracle owner Larry Ellison's 288ft superyacht Musashi in a section of the America's Cup Park known as "techie-billionaire row". Berthed on the other side of Musashi - and in between Mr Ellison's other yacht, Asahi - is Senses, owned by his rival, Larry Page of Google.
Mr Clark said he would like to see Team NZ win the Cup as he believed they would do a better job of reining in the costs to compete. His wife, Australian supermodel Kristy Hinze, would also like to see the Cup back here so they can spend more time in the Southern Hemisphere.
"It's not pleasant to see the way the event has been run here," Mr Clark said. "I'm supporting a team that will be a bit more rational, and make it more accessible for other teams to enter. Sailing is no fun if there are no people involved."
Asked if he would consider mounting a Cup challenge himself should Team NZ win in San Francisco, Mr Clark said: "I've got enough money, but I'm not going to blow $200 million to get my name put on a trophy.
"If [the cost of competing] was in the 50-75 [million-dollar] range and I could put a good team together I would give it some thought, but at the moment I'm not contemplating anything like that."
Sir Russell was unable to be reached for comment last night.
Two more races will be held today. Team NZ lead the match 4-0, with Oracle still needing to win another race before they can start scoring points, as part of sanctions imposed by the international jury after finding the team guilty of gross misconduct.