This is how they draw people in. When they see someone is upset and trying to deal with a problem, the viewer is drawn in. Humans like to see others besides themselves with problems.
Viewers love being in control of the plot. We love to see things go our way, the way we want it. It is so frustrating when you have to go along with the way the editors want the show to go.
Putting a commercial in the beginning of the video may discourage the viewer from watching it. Is there some way the commercial can come in the middle? Or is that technically impossible? Maybe force the viewer to watch it?
Humans love ANYTHING that gives us something to talk about. Youtube sparks conversations. What is cool about it is if someone hasn't seen a certain video, it is so easy to look up. The viewer can go back and view it whenever.