Electronic system is around $10G, Running costs are pretty low, tickets, printer, & vandalism.
The other issue we have currently is people get a permit, fill it out with false info, put no money in the envelope, attach the false permit to their tent and the rangers are none the wiser because they don't go through the cash box and check the cash against permits. Rangers have no access to the cash box in the field for obvious reasons (not we don't trust them, we want them safely covered if an issue occurs)
It is not a booking system, our sites are first in best dressed. It is just to pay and get a permit. A quick report I ran this morning says 28% of the permits issued have incorrect money (rounded up and down to nearest note value, no money, a ashtray full of change, IOUS, Cheques, gum nuts, international cash etc, ). Rangers collecting cash is all bad news if you ask the auditor (and I agree). To cover their butts, our rangers do not even accept the permits with the money in them, people are told to put it in the box.
An electronic system means people cannot get a permit without paying (the correct amount) first. I noticed (thanks google) that NSW runs an electronic system in some parks, any user feedback while I speak to the management about their perception of what goes on?