Authenticity and relevance. Consumer trust for brands and major corporations is near an all-time low. People don’t trust advertising messages or PR from brands because they know there’s an ulterior motive in play; brands want to make money. But targeting a specific niche and speaking directly to them allows you to create content that comes across as more relevant, and therefore more sincere and authentic.
Unlike mass audiences, which represent a large number of people, a niche audience is an influential smaller audience. In television, technology and many industrial practices changed with the post-network era, and niche audiences are now in much greater control of what they watch. In this context of greater viewer control, television networks and production companies are trying to discover ways to profit through new scheduling, new shows, and relying on syndication. This practice of "narrowcasting" also allows advertisers to have a more direct audience for their messages.