You can proselytize all you want for thousands of years and you will never convert the whole world at once.
It also doesn't matter if his tricks stop being effective if he can still sell them effectively. He doesn't care about integrity, clearly, so that wouldn't be a problem for him.
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It also doesn't matter if his tricks stop being effective if he can still sell them effectively. He doesn't care about integrity, clearly, so that wouldn't be a problem for him.