A 2014 study from the IAB (Interactive Advertising Bureau) indicated that 22% of American adults watch original digital video monthly, up from 15% in 2013.
The study also found that 28% watch tv online monthly and 31% watch amateur videos. 46% of those watch on their smartphones, 41% on their tablets, and 48% use internet-connected tv. (Loechner, 2014)
Is this consistent with your habits? What kind of online videos are you watching and what device are you using to watch it? Oh, and do you even look at the advertising preceding it?