Re: "From this point on, I will assume cryonics derives expected utility from it giving a reasonable chance of continuing life past many currently terminal events, with life being a valuable thing."

Life is a valuable thing - but there are other ways of promoting it besides cryonics. In particular, you can give funds to your relatives and their descendants. That is usually how dead people spend their money. Cryonics may be attractive to that section of the population with no family - or no family values.