Auckland Transport spokesman Mark Hannan told the Herald he was unsure why Crone referred to the revenue from parking charges as "profit" as it went directly back into reducing rates for ratepayers.
"It is important to recognise that prices aren't set to maximise revenue, otherwise we would charge the same as [commercial] providers," he said.
"Rather, prices are set at a level laid out in our publicly consulted parking strategy which balances supply and demand. "
Hannan said if parking fees were set too low, there were issues with the availability of parks.
"This is what happened 18 months ago when rates at the Downtown Carpark were too low and the building was often full by late morning.
"Vehicles parked there all day meaning people travelling into the city couldn't find a park."
Lower levels of enforcement or revenue would also mean rates would have to rise to compensate, he said.
Crone said if she was elected mayor, she would ensure any surplus from parking revenue went directly into an investment fund dedicated to public transport infrastructure.