I thought that CEOs of American companies were legally required to maximize profit. Reducing Cook's salary sure whould increase profits.
You have to pay for talent. How many people in the world have the talent to run a $2.4 trillion company effectively.
Yes, Apple has ballooned in valuation. The question is how much of this is attributable to Tim Cook, how much to other Apple employees, how much to external factors (e.g. tech bubble) and how much of it is just sheer inertia.