I don't see it as terribly unfair to charge $8 per year, even from
transient pilots, to fund rescue services in case of a mishap.

No, and it's not terribly unfair for cities, towns and other
municipalities to do the same for aircraft flying over them. Gated
communities that decide to have a registration program are also being
fair to pilots, after all, what's another eight dollars a year and some
paperwork? And the fines if you fail to comply?

I predict the law won't stand. Federal law trumps it, and has in the past.

Jose
--
There are two kinds of people in the world. Those that just want to
know what button to push, and those that want to know what happens when
they push the button.
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