Oh god the "Greed" argument.
What you label as "Greed" others realize can often be ambition. The incentives to support ambition which have pushed the PC industry to the success it has only arrived to it current levels today in our free market society due to the principles of rewarding successful decisions with profits and rewarding failure/bad decisions with firms going out of business.
Thus those who can sate the demand of consumers and provide competitive products flourish and those who cannot go bankrupt or at best languish in obscurity. Yet no one's position in the market-place will ever be permanent and everlasting. Even giants like Microsoft can and will fall eventually and just like one day Valve will one day fall to rival competitor or due to making to many mistakes.
So your idol Gabe Newell and his success in the marketplace is fundamentally due to what you mislabel as "Greed". In fact if someone were to use your flawed logic and reasoning abilities they could also call Gabe Newell "Greedy" for not wanting to compete against Windows and its marketplace app or for not "fairly sharing" his market place grasp on online pc game sales via Steam with their rivals.
As for Apple.....
Apple long ago failed to dominate the desktop marketplace because of its strict control of its software and hardware by Apple.
Microsoft and other hardware and software vendors do not have even remotely the same level of death-grip control on software and hardware on the Windows platform or in the PC hardware market as what can be seen with Apple and its own products.