Why Do Realtors Shoot Videos in Cars?

I don't have to try to sell people houses in the midst of this terrible real estate market, so maybe I don't quite understand the marketing that goes into the realtor game, but I'm not sure I would factor whether or not my agent has a YouTube video of them talking in the car into my decision making process. That, however, doesn't seem to stop real estate agents from making these videos, and now someone with a strange obsession to collect them on one Tumblr site.