> Those kids of work may even help get you promoted and open up more interesting projects.

Do you have any anecdotes in support of this view? My general understanding is that working on such things (if it isn't part of your explicit job description) is usually met by at best gratitude from other people, but certainly not promotions. And there are definite risks: since it is time spent not on your "actual" job, it can show up in performance cycles especially with a mediocre manager.