I would estimate approximately
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM ...
Is it permissible to write III^^^III ?
At which point the weight of all this gold would probably be sufficient to start a gravitational collapse leading to a black hole.
And since the man and the moon would meet inside the black hole, PROBLEM SOLVED!
How much money would it take to engineer biological immortality for at least half of the world's population, within 20 years, with 99% confidence?