Since different uploaders have different marketing goals, YouTube has created new Channel templates to meet their needs whether a YouTuber produces one video a week or has thousands of videos for fans to browse.
Increased focus on videos that matter to each YouTuber (subscriptions, friend's sharing, recommendations). If a channel uploads four videos in a day, a YouTuber will see all four - instead of just the latest video.
Similarly, any Youtuber could include details of what camera they used to shoot the footage, and generate revenue from higher value product advertisers selling video cameras. I've tried talking to my mom about metadata and her eyes glaze over and...
The Tweeter, blogger, or YouTuber who posts the story first has the greatest chance of getting the most links. If you attended SES San Jose last year, you may have seen the Search Engine Foosball Smackdown.