Apple's profit margin should be much better than - for example, Dell's - for a similarily priced item.
Apple doesn't have to split the money with Microsoft. So there's a big profit right there.
Then, Apple's customer support costs should be much lower than the PC clone manufacturers. Mac owners generally have fewer problems than our Wintel counterparts, so we don't need to spend hours on the phone complaining to the Dell dude in India about dead-on-arrival hardware, worms, viruses, spyware, etc.
"hours on the phone complaining to the Dell dude in India"
LOL!