So many communists on MacRumors.com...
He's not getting 400 million dollars because he got promoted. Even if that was the case, I don't think I'd object. A man this talented, particularly since his leaving Apple would hurt Apple, would be an amazing steal for a competitor, or really any company of a certain size. He's a talented man and headhunters would love to nab him for their companies. Apple giving him conditionally 100,000 stock a year for ten years simply a means for Apple's board to reassure stockholders, employees, and Tim Cook himself, that all parties are thrilled, and Tim Cook will be CEO of Apple for a long time. This creates stability, gives added incentive to Tim Cook to keep Apple stock climbing, and is overall a good thing for everyone.
There are people who think 400 million dollars is too much for any one man to have. You are entitled to your opinion, but the marketplace has its own value for men like Tim Cook, and that, whether you like it or not, is in the hundreds of millions of dollars. Why is Tim Cook worth giving a million Apple shares to? Because if Apple didn't, somebody else would, plus or minus other incentives and costs, because big companies worth billions of dollars think Tim Cook is worth having at this price. They actually think he's worth more than that. After all, they expect to profit on this deal.
This sounds like a circular argument, and it is. But that's how capitalism works. You pay for a good at the price it's valued at, because it's valued at the price people are willing to pay. If it helps, think of it as an auction, though it's rarely so formal. Huge executive salaries do not occur in a vacuum. This is not Apple being generous, this is Apple paying what the man is worth on the open market for his labors.
Intellectually, we can say that Tim Cook is getting more money than is reasonable for any individual to have, but we cannot say that he is getting more than he deserves. The fact of the matter is, Apple will profit from paying Tim Cook for his work. They are giving him 100,000 shares a year (which he has no access to until 5/10 years later), because they expect him to make above and beyond that for the company in terms of share value. It is a bit of a gamble, sure, he may tank the stock, at which point the board of course can remove him. He won't get any shares at all in that case, if it's before 5 years, and only half if it's before 10. This deal incentivizes him to increase the stock price, at which point, yes, he'll have earned every penny of his million shares' stock value.
More money than is moral for him to have? Perhaps, but then you should be encouraging him to be philanthropic. Simply wanting Apple to not pay executives what other companies are willing to pay is an argument that will never work in a competitive environment, and the fact of the matter is executives of successful companies make their companies successful and it only makes sense they should have a stake in those companies for their work. Your moral argument is not against executive compensation, it is actually against corporations growing above a certain size, at which point I find it hard to see how morals come into play at all. Corporations are amoral entities, fine. That's different than immoral though, and there is nothing stopping individuals working in a corporation to act morally themselves.
More money than he deserves? Mathematically false. He will either replace his cost to the company and then some, or Apple will find somebody who can and replace him. This is true of any employee in any profit-making enterprise. A corporation profits from the work of the employees, or there is no point in its existence. A man like Tim Cook, working solely for himself, would, Apple's shareholders expect, produce income in excess of his compensation. Perhaps a self-employed Tim Cook would make billions of dollars a year. Instead, he'll make it for Apple, minus his compensation. Why isn't Tim Cook self-employed and taking over the world then? Because there are intangible benefits that cannot be bought. His enjoyment working with the people he gets to work with, the pride working for a company like Apple, the sense of history he feels every day he walks into the building, and things I'm sure only Tim Cook can know about or will discover.