I buy and use Apple products because they make the very best products available at a reasonable price.
Apple makes the very best desktop computer in the world. That's why there's an iMac on my desk.
Apple makes the very best notebook computers in the world. I do not have a notebook computer at this time, but if I did, it would be a tough choice between a MacBook Air and a Retina MacBook Pro.
Apple makes the very best tablet computer, and it's not even close. My iPad (3) is usually nearby, and serves as my mobile computer.
Apple makes the very best smartphone in the world. My white iPhone 5 is always with me. It's easily the best phone you can buy for any amount of money. 1
When I can afford the best of something that I need, i buy it. That's why I don't drive a Ferrari2, but I do use a Mac, iPad, and iPhone. They offer best-in-class experiences without an absurd price tag. If an iPhone cost $1500, I would make do with the Galaxy S III Rage MAXX HD PLUS 4G LTE+++. Fortunately, an iPhone doesn't cost $1500, and I don't have to use such an incredibly well-named phone.