Well, I do think that someone has to be revived to demonstrate it works. This is not the same as saying that cryonics as it is practiced today couldn't work. Something can still work even if it hasn't been demonstrated, but to be demonstrated to work, it has to have already been done. However, I understand why you might want to try it even if it hasn't been demonstrated, given the potential for benefit.
So I still say that the success rate is zero at present, but this number has the potential to go up in the future. I do not equate success rate with probability of success. The probablility of success is unknown.
The probablility of success is unknown.
Something is known about it, and correct decision depends on its value, so by making a decision you implicitly estimate its value. See I don't know, logical rudeness and Scientific Evidence, Legal Evidence, Rational Evidence.
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: