The trust operated at 158 venues nationwide, including Paparoa Hotel and Shotgun Betty's in Whangarei. More than 90 per cent of Northland funds go back into local community groups and sports clubs, Mr Knell said.
"It's outrageous to have a 53 per cent increase," he said. "There used to be 81 societies running machines and now there's 41 - and there's a reduction in machines, so there's far less monitoring to be done.
"Obviously, we're concerned about any loss to the community."
Mr Knell said they were pleased Internal Affairs was consulting as there needed to be more transparency about what the costs were.
The Community Gaming Association said the hike would impact community grants generated by gaming machines.
But the Problem Gambling Foundation said it would lead to increased compliance of a sector which, according to chief executive and Northland regional councillor Graeme Ramsey, had been "a story of poor customer care".
Mr Ramsey said a "mystery shop" by Internal Affairs had found the vast majority of pokie operators were in breach of the Gambling Act.
"The department hasn't increased fees since about 2007, but it can't decrease its compliance efforts - not when the sector hasn't stuck to its legal responsibilities. They've brought this on themselves."
New Zealanders' gambling spend had not fallen significantly, but the department's revenue from operators had, as it was tied to the number of machines.
Internal Affairs Minister Peter Dunne said the higher fees would cover the costs of the gambling law enforcement by the department, which has been financially stretched by investigations into increased non-compliance by pokie operators.
"Through routine audits, venue inspections and inquiries, the department identifies breaches or non-compliance with the Gambling Act about 50 per cent of the time, with varying degrees of severity," Mr Dunne said.
"[The department] is now facing a deficit of $3.8 million this financial year."
Nationally, the number of gaming machines dropped from 20,120 in 2007 to 16,717 at the end of last year.