From a physiology standpoint, it's all about the dopamine rush, a neurotransmitter associated with pleasure and reward.
You see a video that has a shock factor, is funny, or is novel, your brain releases this. Because the feeling is addictive, you crave more of it. And because youtube 's algorithm is geared towards maximising user engagement, it makes you see more and more of this.
In contrast, the high quality, detailed videos will be deemed as "boring", will not induce the dopamine rush, hence will not engage the users.