When analyzing any systems for passive income, it helps to remember this formula I first learnt from my millionaire mentor
Adam Khoo:
Income = Value x Time x Scalability
For example, I rely on my pro-blog
Life Coaches Blog for passive income, but it's not
really passive because I still have to work at it, but it
is a lot more scalable than my full-time job because I can reach out to a larger audience.
A great passive income system would ideally be one where you can reduce the time you put in, and increase the value and scalability.
A good example is Steve, even though he still has to put in the time to write articles for his blog, his value and scalability numbers are so up the scale that the income becomes substantial relative to the time put in.