He makes $4 million/year. Google's net interest income was $167 million last quarter. So if he's able to increase their interest income by more than about .7%,

He makes $4 million/year. Google's net interest income was $167 million last quarter. So if he's able to increase their interest income by more than about .7%, he's worth the $4 million/year for that alone. If you were 1% better than your predecessor at just one aspect of your job, would it be worth your entire annual compensation to your employer? I doubt it. With a company that huge, a tiny improvement in their financial policies can make a massive difference -- and the people who can effect such changes are worth a premium.