commuting should definitely be factored in. You don't commute for fun, you only commute for the job. It's an expense that occurs every time you work and, as you

commuting should definitely be factored in. You don't commute for fun, you only commute for the job. It's an expense that occurs every time you work and, as you said, a fixed cost that becomes more important the lower paying your job is. In the end, it's what you take home and that's what the article is about.