I think it is a bit more complex than that.
Being involved with rescue for 20 years I saw some varied methods regarding funding etc. My experience is certainly limited being just the guy out helping and in limited locations.
I did this as a volunteer for the most part, did have some compensation financially, or could be deemed as such. For example on a FEMA mission all expenses paid as well as an hourly wage higher than my employment, and the same as say a cardiac surgeon would recieve as a team member. FEMA training outside of my home state; equipment, transportation, meals and lodging provided.
As volunteer K-9 SAR (outside of FEMA missions) we were required to provide all our equipment, supplies etc, associated costs such as medical care resulting from, transportation and with CAP transportation commit to three days minimum (or lost wages for me) and grateful for any contributions. A member had the additional role of seeking grants and private funding. These were used or directed for equipment such as beepers and radios. Basically it was a labor of love although when in the most grueling situations I wondered at my sanity.
It was interesting to see the differences between Law Enforcement (who most commonly requested us) counties, cities and states resources.
The Army showing up with a full Blackhawk, depositing the solders on the ground while the Helo transported us in out and around all day. What appeared to be every Tom Dick and Harry and thier large horse trailers from miles around eager to volunteer assistance…Gee my Suburban won’t make it in there, I’ll call Jim Bob and get his Hummer for you. Seeing what seemed a lot of officers, finding out it was every one in the county on and off duty except for Paul whose wife was due any minute. A county I would have thought rather rich by population (supported by taxes) or paid personnel and services with one officer or the sheriff driving his personal vehicle, it was all up to us.
One county each team had their own deputy charged with providing whatever we needed. I expressed my surprise at what seemed to me outlandishly expensive resources for such a Podunk county having pretty much one small town far off the road to anywhere. Well, turns out that county stretch of I15 was quite popular with the drug smugglers. You think we bought all these autos, trailers, boats, motor homes and state of the art communications and electronics? Did you see that brand new Cessna? Guy ran out of gas.
As for charging for a rescue, I would agree in principal but don’t see how to draw lines with any fairness, or humane ways.
Example. One of my searches was 3 generations out hunting. Dad was the idiot and the one that died. Lot of resources put to the rescue. Who is going to pay for that; the surviving wife now without its sole source of support?
Plus, I’m loathe to invite in the scuba police.