Creating your 'own' 'unique' 'high Quality' content is what makes your videos to become noticed by your audience but Youtube is not only for fun and education.You can do anything you want or anything you are good/experienced at/As I said it may takes some time but still more sooner than what people thing but in meanwhile 90% of the people will give up that is why we got less successful compared to total number of channels.
While you are right and there is a lot of money to be made on those platforms at the same time it is not as if everyone can produce that kind of content, many of those that give up is because they did not really had the skill or talent to pull it off anyway, while those that keep trying not only have the determination, they know they have good content but it has not gone viral and they know they only need one video to change their luck.
And for the most part they are right, if anything this is very similar to what happens in many creative industries, for example in the music industry there are many musicians that want to be the next star but very few have star quality and they give up, but the rest keep trying knowing the only thing they need is one good song and they could change their lives almost immediately.