Price is a non-issue since I've already bought both, though it is certainly keeping me from upgrading to a newer Macbook Air. Why spend so much to upgrade to a laptop that I'll barely use?

With the Chromebook, I get longer battery life, a lighter frame, a faster startup time, no fans/heating issues, and more consistent keyboard shortcuts (there's only one set to remember because there's only one app). Some of these might not be issues with the MBA line anymore, but mine is a first-gen machine.

Aside from the things I mentioned in my original comment, my Macbook Air is really just a keyboard, web browser, and terminal to me. Well, the Chromebook is too, and it's a better one at that.

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.

Price.