Marketing on the Internet isn't as similar to regular marketing as many would like to believe. The "culture" of the Internet has a fairly consistent history of being skeptical about most commercial endeavors and also has what some might call an over-sensitive sales pitch detector.
In no generation is this more prominent than among the millennials, which includes everyone born between 1980 and the early 2000s. Getting the word out to these folks, even in a video, about something you charge money for can be more difficult than it needs to be if you don't follow a few basic rules.