It's a bad strategy for someone who'll die soon, because they can't get life insurance. Cryonics is cheaper when young and healthy.
People who are young and healthy usually end up becoming people who are likely to die soon.
I'm guessing that's why it's a good strategy to get cryonics when you're young and healthy.
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: