If that title appeals to you, sorry to disappoint, but REAL spiritual development is not going to make you millions.  Yes there are some so-called spiritual teachers who write books and conduct seminars and make millions doing it, but are they real spiritual teachers?  What these guys teach is  limited, basic spiritual knowledge.  It's like buying a book by a nutritionist on heathy eating and all it says is, "Eat your vegetables!".  
    A real spiritual teacher isn't going to make millions from those endeavors for two primary reasons:

• First, a real spiritual teacher is  interested in developing her own spiritual side as well as that of her students, and that is more important to her than making huge amounts of money, and the teachers ability to develop spiritually will be limited if she is doing it for fame and fortune
• Second, A spiritual teachers primary concern is to help people develop spiritually and that means helping people based on who is most ready to develop and most capable of spiritual development, not on who can pay the most to get those teachings.

Of course spiritual teachers have to make some money.  Like everyone else, they have expenses.  But they don't get wealthy from teaching spiritual development techniques.