What if Satoshi sold his keys, not his coins?

Satoshi would be out there in the world with a whole bunch of unreported fiat, little or no Bitcoin, and deep protocol expertise.

The buyer would have to be almost as visionary as Satoshi to drop a big chunk of fiat that early in Bitcoin's life. So he'd be out there with the keys to one of the greatest fortunes on earth, a pretty good track record of seeing the writing on the wall, and maybe comparatively little fiat wealth.

How would both the Buyer and Satoshi behave in the world today in that imagined scenario?