I think that it really has to do with Steve Jobs really thinking that other products are ugly and not refined. He has this deep inside of him. I recall when he bought the Jackling House in Woodside, CA he only had an expensive Bose stereo system and a BMW motorcycle inside because he felt he could not find products he liked. He slept on a mattress on the floor even.

To this day, he doesn't put a plate on his Mercedes because he thinks the font is ugly.