I wish this attitude weren't so prevalent on HN - no offense to you, but do you know how pretentious that sounds?
People who enjoy working a rewarding job are "rationalizing their addiction"?
[edit] Specifically, I object to the false polarization of this topic: working a job means bowing to The Man, working on boring crap with stupid bosses, and other such nonsense. It does a disservice to both people who work at a job, and people who are in business for themselves by generating false expectations.
Entrepreneurship is not a silver bullet to your boredom, nor is it a guaranteed ticket to working only on things you love. Nor is employment a silver bullet solution to stability and consistency. This polarized portrayal of either side really just adds noise to the discussion.
tl;dr: Working at a job doesn't mean you don't work on things you are passionate about. Working for yourself doesn't mean you get to avoid all the tedium you used to deal with on the job.