Why do people think drug dealers dont make a lot of money when they actually do?

If I was growing and selling weed and shrooms and opium why wouldn't I make a lot of money when drugs have always been used since before human civilization appeared? Look at the cartels in Mexico at their power by selling drugs and they're practically de facto rulers of Mexico, Afghanistan is the largest exporter of opium and heroin on earth.
Why do people think drug dealers dont make a lot of money when they actually do?
Why do people think drug dealers dont make a lot of money when they actually do?
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