There is no secret about video podcasting. This is a way for distribution centers, i.e. You Tubes, to consolidate page viewing which, in turn, establishes their site as a major player. Content has been the problem for distribution companies for some time now, there just isn't enough 'value content' for a world with so many cable stations and internet sources. So why not seduce the creative juices of the masses to produce content for free, occasionally throwing these dedicated creators a bone, like syndication, prizes, and/or their 15 minutes of fame.
But for me, there might be one more incentive. I could use it to see myself and perhaps resolve my issues concerning weight loss, by consistently going public.