How I Made $40k Off a Book Before I Even Published It
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I’d atribute it to the same reason. Time and again I observe that the size of one’s audience matters more than the quality of the output. It’s irrelevant how mediocre your product is as long as you have followers to market it to—and the more they already like you, the crappier your offering can be.
Which makes these “what I did” posts useless to most. It was what you had (an established audience) that had the biggest influence in your success.