Is it true that many Reddit posts are fake? What's the point of a fake post?

When I hear Shayne and Damian at Smosh frequently commenting that they think one Reddit story or another is fake, I'm honestly surprised. As far as I know there's no such thing as a Reddit influencer. I can't imagine how someone would make money from posting on Reddit. Even if someone was farming they'd get... What out of that? Other than just posting fake stories for the dopamine rush of personal attention, why would someone do this? Thoughts?