That still doesn't make for a fair comparison for what the Air is, but what you'd use it for. The two are not the same.
As far as performance goes, my 2011 11" Macbook Air was my primary development machine for a year (in both Xcode and IntelliJ/Scala). That Air also sported better battery life than any of the Eee PC line. It was more expensive, sure, but $500 is not very much when I'm using the machine for 6+ hours every day of the year. It was also more capable than that Eee PC and ran an operating system I found actually enjoyable to use (versus merely tolerable in the case of Windows or Linux); I have no problem paying $200-$300 more simply because of the feature that is OS X because for me, it's better.
And I haven't even touched on the build quality, which--in rather stark contrast to your attempted handwaving of an Air being "insubstantial" in another comment in this thread--is fantastic and makes me feel happy to use it, makes me enjoy working with it more. (Form is not superfluous. Pleasing form makes interacting with the computer more enjoyable, much like a well-designed tool in my shop or my kitchen.)
As far as performance goes, my 2011 11" Macbook Air was my primary development machine for a year (in both Xcode and IntelliJ/Scala). That Air also sported better battery life than any of the Eee PC line. It was more expensive, sure, but $500 is not very much when I'm using the machine for 6+ hours every day of the year. It was also more capable than that Eee PC and ran an operating system I found actually enjoyable to use (versus merely tolerable in the case of Windows or Linux); I have no problem paying $200-$300 more simply because of the feature that is OS X because for me, it's better.
And I haven't even touched on the build quality, which--in rather stark contrast to your attempted handwaving of an Air being "insubstantial" in another comment in this thread--is fantastic and makes me feel happy to use it, makes me enjoy working with it more. (Form is not superfluous. Pleasing form makes interacting with the computer more enjoyable, much like a well-designed tool in my shop or my kitchen.)