> You invest in a promise that may or may not be reality I don't think cryonics organisations promise that you will eventually be revived. They promise to try,

> You invest in a promise that may or may not be reality I don't think cryonics organisations promise that you will eventually be revived. They promise to try, and they probably think there's a higher chance of it happening than most people do. (But perhaps not higher than most people who pay for cryonics.) With that in mind, the structure you describe is "pay someone to try to do something that might not work", which also describes investing in startups and any number of other things. Your objection here is that you don't think cryonics will work. That's a reasonable objection, but the way you're framing it is uncharitable.