It's 4x cheaper ($250 vs. $1000), for one. If you realize you are spending 90% of your time doing work (or not) in the Chrome browser, why not just get a Chromebook then? A lot of people are arguing that Chromebooks are better for school kids, too, than more expensive desktops, laptops, or even ipads.

I have a mac laptop at work, which I only keep around for video editing, but you can even do basic video editing in the browser nowadays, with sites such as WeVideo and Pixorial.