Because of self awareness I would say. People who are trying to get motivated realize that 90% of the ways most people think about motivation is actually unhelpful.

Sharing an image of a super rich person is "fun" because you get to imagine you're super rich. If you take it a step further and actually think about it you realize a particular set of circumstances that you don't have allowed them to be as rich as they are. But people will still share the pictures because they like to feel good about themselves thinking "that could be me" sure it's a positive emotion but it's really not that motivating.

Real motivation comes from discipline, faith in oneself, and understanding that while you may not end up where you intend, you'll end up somewhere better by getting up and trying consistently than just letting things sit.