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people are selling money making guides since forever (ebooks etc)... 90% of them would share some very saturated or obvious information (might be interesting for noobs tho) trying to make it look like decent knowledge... a very few people would sell information about very effective methods which they actually make decent money with, especially their secret twists (they are not stupid), probably for a very high price while building a client list or something and usually besides having some other project that's more important to them
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