Show Full Article Watch the video above. The Walking Dead season 7 finale aired Sunday night, with the AMC series returning in October. Having first began in 2003 as a comic book series, Robert Kirkman’s creation made the jump to television in 2010, spawning a mega-franchise that includes video games, conventions, and attractions. The Walking Dead isn’t just in the business of killing walkers. Now, seven seasons in and counting, the brand is still as valuable as ever. In 2016, 289,000 copies of the books were sold and ads during an episode cost $470,410. The latest video from Coinage, Time Inc’s new personal finance video company, explores the booming industry that is The Walking Dead.