First, where do you get those estimates from ? I can only speak for myself, but I wouldn't put figures on estimates when it doesn't seem like even a consensus of experts would get any of those right, as they verge on questions more or less unsolved. Particularly 3 + 5, and 1 too, are going to yield totally speculative (subjective) estimates.

By that I mean that even if your estimate is as good as you can hope to make it, the real world event that you'd bet on will probably turn to be otherwise, like totally unexpected. Spread those confidence bounds. Orders of magnitude larger. Let's admit we don't know. Narrow, focused probability estimates must mean that you know better than you'd by chance, and for that to be true you ought to have good, practical reasons to believe you do.

Then, even if we don't know, and even if the probability of cryonics working is very, very small ... I'd expect that since your life is instrumentally necessary, for you to experience or do anything, that it supersedes in utility most if not all of the other things you value. You may think you love, I don't know, chocolate more than life, but if you're dead, you can't pursue or value, even, that one. Likely so for anything else. Love, friendship, freedom, etc. Given that, shouldn't you be ready to protect your prospects of survival as well as you can ? The only reason to avoid cryonics then, is if the cost of it, makes it impossible for you to invest in another strategy whose potential to sustain your life (indefinitely) is bigger than cryonics'. If not, and you can take on both, then no matter how low the probability of cryonics working, it'd still be rational to invest in it.

(Only other issue I can see with this outlook is that it has some potential to turn you into a money pump, as long as there's a way to justify your bleeding of money no matter what the cost, to secure trillionth after trillionth of a chance to save your life, so long as you can still afford it, down to your las disposable penny.)