There's a great deal of luck involved. Casey is a curious case of someone who is not interesting, deep, gifted or talented at anything, and yet has a massive audience.

With Casey, he was doing online video, when so few people were, that anything could become a smash hit. His other hits have to do with him already being an established name.

It is not unlike Dan Bilzerian - except Dan openly admits he got very lucky to end up where he is at, and so there aren't articles being written on how to become the next Dan or use his 'poker strategy', or maybe there are, I wouldn't be surprised :)