Can I make a lot of money making up lies and selling a quackery pill to "cure" this medical lie?

Probably. It depends on how good you are as a salesman. Wealthy quacks are good salesmen.
Lots of competitors. You wouldn't be the first, or the thousandth. However, you must target either conservatives by pretending to be deeply religious, or liberals by pretending to be deeply in harmony with nature. Play also to that group's politics. I respect both camps, but quacks are taught how to abuse the good in people. Lying brazenly is legal in the us unless you do it on a medicine bottle.