The vast majority of Apple's customers are Apple fans, people who merely wish to think different, nothing more, nothing less.
Edit: Don't downvote just to disagree. Comment and state your reasoning on why you think I'm wrong. If you work for a company that only issues Apple devices, please speak up with your experience on how this went, and, if possible, why the company didn't go with Windows or Linux computers instead.
For the comments that try to bring up software development roles: most software developers I know either use Windows or use Linux on the desktop, and loath OSX worse than I do. Very few prefer OSX.
The few people I know that prefer OSX (and will die on that hill) are frontend developers.