Avantages
there are 10% people who are getting rich because rest 90% are getting poor. You want to be in 10% then you must know how to tick people and make them believe that they made the best decision of there life.
Inconvénients
you can not create money from thin air. there business model is based on pyramid structure which is unstable and will fail. let say you made a video and uploaded on youtube, and you told 2 people to watch it, then told those 2 people to tell 2 people to watch then each of them tell 2 and this goes on.....after 33 cycles entire population on the planet have watched that video. And we still have 4.2 billion people who did tell further because there is no one left out to tell. this pure maths. and this model will fail.