The magic bean scenario has a low prior, and you haven't provided any evidence, just a claim, so it's not really comparable. On the other hand it is the sort of thing that would be easy to prove if it worked (assuming you have multiple beans) -- just feed one to someone who is about to die.
Cryonics is not easy to prove if it works because the level of technology we are at is not anywhere near the theoretical maximum where repairing the damage of cryopreservation is concerned. You would have to base your opinion on indirect evidence, such as whether the structure of the brain appears preserved.
As to the brain/metabolic activity question, that's possible to answer by examining samples that are cryopreserved and thawed. Turns out they resume electrical and chemical activity just fine. The fundamental barrier is structural preservation and avoiding/limiting toxicity effects from the cryoprotectants.
Now, you might argue rationally in favor of allocating funding towards cryobiology research instead of your own future arrangements, but I'm inclined to think people with cryonics arrangements will allocate more money towards cryobiology research than disinterested outsiders.
The magic bean scenario has a low prior, and you haven't provided any evidence, just a claim, so it's not really comparable.
Agreed, but I was arguing specifically against saturn's apparent claim that you should spend money on any process that promises to allow you to live forever, no matter how unlikely (assuming that you actually want to live forever, of course, which we do).
...Cryonics is not easy to prove if it works because the level of technology we are at is not anywhere near the theoretical maximum where repairing the damage of cryopreservation i
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: