Bill Gates essentially made his billions by bundling FAT with floppy disks. Genius.
He was also a very good marketer. People fail to realize that Windoze is not how he made Microsoft into the empire that it is now.
Compare what was done with Winblows versus the *nix operating systems and how you market a product (or don't market it, in the case of most *nix operating systems) changes the public's perception as to what is your standard PC.
Not saying that the guy doesn't justly deserve his riches or anything.
He knew the right people (networking) and marketed his brand.
Kudos to Bill.