If you are at all interested in public policy, a JD without passing the bar can be quite useful in Washington, D.C. You can be a lobbyist, or a Hill staffer, or an administration official, or (a certain type of) a bureaucrat, a trade association wonk, a think tank wonk, a public interest wonk, and many other jobs all without bothering with the bar. Only some of the jobs pay extremely well, but all can be stepping stones to those high-paying jobs.
On the other hand, there is also a snobbishness in D.C. among non-lawyers that people with JDs are merely technicians, like plumbers -- you call them in to research the law and draft ideas into actual legislation, but they don't necessarily do the real thinking. If you were to find yourself in this kind of career ghetto, passing the bar would be a good way to break out.
Just remember that you can take the bar any time, it doesn't have to be right after law school.