Anyone who sees Bitcoin's popularity wants to make a profit from it. Network marketing is one of the sectors that wants to get this pastry share in the systems. Is it good to use bitcoin (crypto currency) by network marketing companies? How does this affect people's perspective on bitcoin?
For me MLM companies because you are refering to them probably, are like literally scam. They are always with little changes giving propaganda of success. You will be sucessfull, you will become rich, you will be great, you are great... just give us your money 
. They taking money for books (for you to learn of course), for teaching courses (for you to become great of course) etc.Stay away from companies like that, you will loose your time and money.
I pretty much agree. One little talked about issue is the difference between a pyramid company (totally illegal) and a MLM (perfectly legal).
Any guess as to what separates the two - legally?
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just give us your money . They taking money for books (for you to learn of course), for teaching courses (for you to become great of course) etc.
. They taking money for books (for you to learn of course), for teaching courses (for you to become great of course) etc.When a company earns more from the participants than it does from sales to customers it is approaching the line of becoming an illegal pyramid.
In other words, if the participants all earn their money by getting people in it rather than by actually selling product then they are in dangerous waters.
That's why mine is free. The only "investment" I ask for is that they invest the web traffic to their website (80% of the time they aren't selling it or trying to monetize it so it is usually already going to waste). And, very important is the fact that the only product we sell is one created by the members themselves