B&W photography has increased in popularity in recent years. This has delighted many photographers who consider themselves fine artists. Some consider color to simply be distracting. I'm not sure I totally agree with this, but it is true that a successful image shot in B&W, does rely more heavily on good composition.
I always discuss with clients their personal preferences for photography, including usage of B&W and color film formats. I find B&W films are particularly effective for candids.