Economic commentators say New Zealand should have built a national convention centre 10 years ago and has been missing out on a hugely lucrative crowd.
The social cost of SkyCity's proposed expansion is still being debated, but Auckland businesses say the benefits of the other half of the deal, a national convention centre, are clearer.
SkyCity has offered to pay for the $350 million centre in downtown Auckland if the Government lets it expand by up to 500 gaming machines.
The national convention centre could hold 3500 people, and conference organisers told the Herald there was a growing market for centres of this size, especially in the Asia-Pacific region.
Auckland Chamber of Commerce head Michael Barnett said large conferences usually outperformed sporting events, noting that a law conference earned more for the economy than hosting the Commonwealth Games.