Because they have never experienced anything better or been very slowly gotten used to it (5 second ad every 10th video, then every 9th and to whatever we have

Because they have never experienced anything better or been very slowly gotten used to it (5 second ad every 10th video, then every 9th and to whatever we have right now). That's pretty much it. That's also the reason why us, people who don't see that many ads, can't go through a single ad. Because we haven't gotten used to the other side.