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Exactly what I'm thinking. Why would someone pay me for stuff he gets for free somewhere else?

Well, people pay for no reason.

For instance, some people pay a lot of money to understand more about the unconscious mind. While they can get any Sigmund Freud's book for less than $5 on Kindle.

Still won't feel right to do that.

I would like to provide a 'Mehrwert' (added value) like we say in Germany. It has to be worth for someone to buy it.