"To be honest, $500,000 was the best round number we could come up with.
"It will definitely get past that and I think it will go close to $600,000.
"This is totally uncharted territory for Wednesday racing and will enormously boost the profile of the Matamata meeting. "And, of course, could make for an incredible Christmas present for somebody."
But Ellerslie bosses will be hoping the pool is not struck because if it jackpots again it could be guaranteed to $1 million at their meeting on December 28.
And the jackpots, should they continue, come with no limit.
"The Pick6 jackpot rules, where it had to go once it got to $1 million, are no more and effectively if $33 chances keep winning the last leg, like they did yesterday, we could see it jackpot up to $5 million," said Dore.
The TAB will resist any temptation to divert the huge jackpots to a premier day like Ellerslie on Boxing Day, a meeting that doesn't really need any financial help.
Meanwhile, star 3-year-old Antonio Lombardo has drawn barrier six in a field of nine as he takes on the older horses in the $70,000 Challenge Stakes at Awapuni on Saturday.
He is reverting to 1400m after his luckless third over 1600m in the Levin Classic last start, an indication he is more likely to end up in the Railway Stakes or Telegraph Handicap this summer than the NZ Derby.