This might get me blasted off the face of the Internet, but by my (admittedly primitive) calculations, there is a >95% chance that I will live to see the end of the world as we know it, whether that be a positive or negative end. I do not see any reason to sign up for cryonics, as it will merely constitute a drain on my currently available resources with no tangible benefit.

Probably no tangible benefit, but expected utility? Those few percent, or tenths of a percent, where cryonics saves you are worth a lot (assuming you have values that make cryonics worth considering in the first place).

(Full disclosure: I'm not signed up, but only because I think cryonics costs would come from the same "far-mode speculative futurism" mental account as better uses of money, rather than "luxury consumption". If not for that consideration — which I'm not all that sure about in any case — the decision would be massively overdetermined.)