The retired businessman, who calls himself a hobby breeder, has owned a string of horses including Epsom and Doncaster runner-up Johan's Toy and Operetta Lass, which won the Adrian Knox in 2006.

Both were trained by Guy Walter but the poor state of the industry in NSW forced Bergstorm to move his racing interests to Victoria with Extra Zero now trained by David Hayes.

"I have grown up in Sydney and it was a very difficult decision to make," Bergstorm said. "Guy had done a fantastic job for us but things were pointing to us going away from NSW.

"We went through EI, World Youth Day and a few changes at Warwick Farm.

"The final straw was the prize money decrease and we won't be back to Sydney until things change. Victoria is just so much better."

Extra Zero is a half-brother to Johan's Toy and Operetta Lass out Bergstrom's mare Extra Bubbly, and has already been the centre of a couple of bids from Hong Kong.

"We never really got to talking about a price but I have one in mind and it's $2 million," he said.

"He is still an entire and, like any breeder, I would love to have one that I bred become a stallion. I'm sure he will be worth a lot more than that if he was to win the derby on Saturday."

Extra Zero has won once in seven starts but was considered one of the top elects for the derby before failing as favourite in the AAMI Vase (2040m) at Moonee Valley.

He struggled to fifth after a wide run last week, but on his fourth in the Caulfield Guineas and a nose second in the Stutt Stakes, he remains under notice.

"David has always said he is the best three-year-old stayer in stable and the derby has been the target from the start of the campaign," Bergstrom said.

"We were really disappointed last week because we thought he would win. The good thing is that he isn't going into Saturday with any expectations on him."