What your job listing doesn't say about your company

My team and I have been working very hard to make our office workspace a great experience from door to door, so that people love their work environment. A shitty commute can be just as much of a negative as slow internet or annoying interruptions.

This has become even more clear as we've been talking with HR directors and visiting lots of careers pages as we've been bringing on beta customers for our side project: http://www.floorplan.io

As I write this, there are 34 job listings on Hacker News. Only 7 of those mention a location in the title of the post.

Of the remaining 27, three don't list an office location in the job description. (Teespring, Flexport, and Metricwire - they say Canada, but I would argue that's a little vague)

Why do you think this is? Are HN companies assuming readers are in SF (~2/3rds of the jobs are, but are the readers?) Or are company growth / cool technology more important?

Just a casual observation.

Reference: https://docs.google.com/spreadsheets/d/1MOr-wZK2zMUS-c5jlRuIS8j5MAYh8xBcyTuOiF6I9uM/edit?usp=sharing