I find that surprising. Even if you don't have anything unrecoverable, like personal photos and such, just having to reinstall and reconfigure everything from scratch is more than enough reason for me to backup stuff up. Especially since I know I won't remember half of it.
I actually did a wipe and clean install of my computer a few months ago. I couldn't think of a single thing to keep so I didn't and the only thing I've reinstalled since then is Chrome.
