The man, who declined to be named, said he was surprised to learn the Showdown - billed as a ''charity boxing event'' - returned only $22,000 to its chosen charity, the Otago Community Hospice.
The event, which attracted strong commercial sponsorship arrangements, had 90 tables costing $1500 to $3000, hospitality suites and grandstand seating.
However Southern Showdown organiser Doug Kamo said the amount returned to the charity came from a main and silent auction, and was not the final tally.
In addition to the auctions, the Otago Community Hospice would also benefit from donations generated from suit hires, programme sales, coat check, bus transport, and commission from some table sales.
A final amount was yet to be confirmed.
''People need to understand the event is a vehicle to raise the profile of the charity, and also to give an opportunity for the charitable auction to take place.''
Last year's inaugural Southern Showdown raised $32,500 for the Malcam Trust, and the difference may have been due to specific auction items, he said.
''We are the event company that promotes the event. We need to make sure it gets across the line.
"If there is a loss, we soak that up, and [the charity] still gets the charitable amount that they make on the night.''
It was likely expression of interest would be called for the charity to benefit from next year's event.
Otago Community Hospice chief executive Ginny Green said the Southern Showdown was a ''great event, and the exposure for us was great''.
''Many of the fighters have indicated they want to keep on supporting the hospice by volunteering or being ambassadors for our cause, so it is a great PR exercise."
