Besides having a solid payoff for your personal finances, a 100-level knowledge of bookkeeping and accounting, I'd argue, confer near "super powers" when it comes to dealing with finance and accounting people. Bookkeeping is one of the oldest and longest-practiced IT disciplines. Your work probably touches revenue / expenses for your employer and someday you'll need to interface with accounting or finance people. Being able to speak the language, even poorly, has helped me gain trust and credibility that I don't believe speaking only in IT terms would have.