The average period of ownership for his prior two companies was under 4.5 years, given that he took a break in between ("to learn to kiteboard, traveling to the Dominican Republic, Panama, Israel and Mexico"). One was sold, no word on the other.
He's asking employees to stick with a job longer than he EVER has.
And he's asking them to have faith that, if he sells again, the new owner will respect this bonus policy.
I'd have zero faith in this. But then, unemployment being what it is, I probably wouldn't quit, either.