it's actually quite simple, money, apple doesn't have the cash to to make all the research and development for chips, they just didn't go that way when they started, it's the same reason dell, hp, compaq, micron, and any other doesn't make the chips, they make the machines, apple does just that, most of apple's software they never make either, they just buy other people's, like itunes is actually soundjam if you remember that program, osx was bought and so are most everything else, apple is a company just like others of the same kind, they put the computers together, they make partnerships with others, like motorolla so that they both make a profit, motorolla needs help so they go to ibm, it's a chain, and it's business.