I dont think its always as clear cut as is portrayed in the video. In that case yes, it's warner brothers and a well know writer, but sometimes to able to say 'my work can be seen on ............................' (insert well know outlet) may be the bit of credibility you need to get an importanr job. It may also be the motivation you need personally to think 'my work is good enough'.
Anyway, here is another video about the same guy where he talks (at the end) about giving his work away for free (and just being credited with it)
http://www.youtube.com/watch?v=DwyyJ...eature=related