Open a Dell and a MBP though, and take a peek.
Have the same money been spend on the Dells internal case design? Is the Dell assembled with the same attention to detail? Does the Dell sport various small and big innovations, from the mag safe adapter to auto-inverted Ethernet port, non protruding camera, lid magnets, etc? Does the Dell have a unique in industry machined aluminum "concrete" case design? Is it as light? Is it as thin? Is is as sturdy? Was even the industrial designer designing the Dell as well paid and respected by his peers as Ives? Oh, and does the Dell hold its resale value just as well?
Now, if you take a high-end Sony or Lenovo laptop, with comparable construction, it's often the case that the Apple laptop is cheaper or same price.
Oh, and regarding tablets, media players and phones, Apple completely smoked the competition in pricing. Wasn't the Samsung tablet for example like $799 for a version competing (badly) with the $499 iPad?