Steve did not have a salary because he was cheating the government out of rightfully owed taxes. Steve was greedy and took pride in cheating the government out taxes (vote down if you know it's true but are just a Jobs defending fanboy).
The entire point of restricted stock is that it ties the wealth of the person who receives it directly to the results of the company. Restricted stock must be vested over a period of years, and what the recipient ends up with depends completely on how the stock performs over that period. In contrast, a salary or cash bonus rewards a chief executive for having successfully placed his fan club on the Board of Directors.
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Correct. And if he had done something noteworthy at some other organization, I'm sure recruiters would have brought him to their attention.
Information in this area is a lot cloudier than you may imagine. I've worked as a staffer to top executives in Fortune 100 company, and sometimes the main talent some of these guys (male and female) possess is purely the way they present themselves-- that, and picking good staff.