Chief executive Paul Crimp said if the council went "the whole hog" and charged compulsory fees, there would be obligations to go with it.
By law, charging fees would mean the campsites would be treated like a business and upgrades and providing facilities like laundries and drinking water were likely.
This would cost council money to set up and run.
Mr Crimp said with an honesty box system, there was a high risk of vandalism.
Councillor Brian Jephson said there was already a successful honesty box system running at the Ngawi camping site, set up by the Ngawi Ratepayers Association.
He said the association wanted to tidy the site up and has used the money to improve the campground, such as adding planter boxes.
"It came about after a lot of people said where can we donate some money for this?
"Campers are more than willing to pay."
Mr Crimp said council did not want to take it off the association if it was working.
Deputy mayor Viv Napier said if it continued with its work, it would continue to draw people there. Councillor Julie Riddell said the ratepayers needed to be applauded.
"The place is just so tidy, it's really immaculate."
Councillors opted not to put an honesty box at the Fell Museum site in Featherston because its central location meant it could be at risk of theft and vandalism.
The report estimated secure, sturdy boxes could cost $900 each but Mr Jephson said the ones at Ngawi cost $100 each.
The boxes will be put in place in time for the 2014-15 summer camping season.