There's some research that suggests that videos that actually help people to learn aren't pleasant to watch. http://chronicle.com/article/Confuse-Students-to-Help-Them/148385/

"It seems that, if you just present the correct information, five things happen," he said. "One, students think they know it. Two, they don’t pay their utmost attention. Three, they don’t recognize that what was presented differs from what they were already thinking. Four, they don’t learn a thing. And five, perhaps most troublingly, they get more confident in the ideas they were thinking before."

If the student feels confused by the video they are more likely to actually update.

The kind of informational videos that are popular aren't useful for learning and vice versa.