He can short his own coin and also unload a million on the books at the same time, creating both a huge profit and enormous financial tidal wave. You get both profit and a black swan event. Hardly a "for nothing" waste.
As I stated, the odds of him just losing the keys are not really that high, and if he wasn't planning to do anything with them, he most likely would have sent them to a black hole address to increase faith in the project.
I would say there's at least a 50% chance of those coins moving some day in the future. This makes him a trusted 3rd party, kind of invalidating his own whitepaper.
Yeah...
Open wide...
for...
Satoshi..
...