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If you're able to double your money consistently you should keep the method to yourself. Scale up and exploit that method before others figure out what you've done. I haven't had consistent margins like that for almost 10 years.
A heart surgeon doesn't need to learn all other forms of medicine. He's a specialist that makes good money. Why would he want to become a dentist? Maybe he'd like to open his own practice but he doesn't need learn the other stuff himself. He would hire people with that skill set and knowledge.
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