Defined as “Does cryonics preserve cellular structure and brain pattern?” the answer is “yes.” Defined as “Do we have cryonics patients who have been resuscitated?” the answer is “not yet.
However, there are multiple proofs of concept. Cryopreserved humans who were “frozen” as eggs are walking the planet, literally thousands of them.
There is a lump sum due at the time of cryopreservation. This pays for the cost of transportation, cryopreservation protocols, and also for ongoing costs of maintenance for the cryonics patient. This lump sum is normally covered with a dedicated life insurance policy.
Cryonics organizations also have membership dues, which are separate from the cost of the cryonics life insurance. There are no additional costs due once a member is in cryopreservation.