The primary motivation behind this action was the refusal of life insurance companies to provide coverage for the astronauts.
Consequently, the astronauts devised a strategy involving the signing of hundreds of postal covers.
The ability of astronauts to obtain much life insurance was limited, so they signed hundreds of postal covers before they left, on the presumption that they would become highly valuable in the event of their death.
[2][3] Apollo 11 insurance covers normally fetch the highest prices because it was the first lunar landing mission.
The essence of a true insurance cover is the fact that it was signed while in quarantine prior to launch and that it was one of those that were left behind for the crew families in the event of disaster.