Extremely low initial investment to get started.
combined with
Potential extremely high returns.
For me its 100 percent all business. I could care less about the content.
edit* What innitially got my attention was when I was like 15 and in high school I did alot of spamming and made several hundred in just a week or so. Wish I would have kept with it but was starting to feel some heat from authorities so quit. I never forgot it though so years later I knew that there was no other option but to be my own boss and combined with my first sentences in this post, the decision was easy.
