maybe the rangers should start taking deposits lol. "safety deposits" as insurance against future rescue. i say that sarcastically, but it actually doesn't seem like the worst idea ever.
...or just use taxes because it's a super low amount anyway and the payment structure is already in place
(i actually agree with this, it's just everyone else seemed to think it was an awful waste of government resources to fish a few people out of the wild a year, or whatever)
There are some popular multi-day trails in New Zealand that do this. You have to register months ahead of time to get a slot, and a rescue deposit is required.