We have earthquake insurance, we've had it since we moved here 4+ years ago. Our yearly payment is about the same as your quote. Interestingly, when lived in the SF Bay Area, the quote was about triple that amount...
With the San Andreas fault running essentially through our and everyone elses' back (or front) yards, it seemed to us to be a good idea.
When we had the magnitude 4+ earthquake a few months ago it gave a me little piece of mind.
Other opinions may vary...