I don't think J. K. Rowling's success can be used as a barometer.
Yes, she ended up selling over 350 million books, is reportedly a billionaire (according to Forbes, at least, though Rowling herself denies it) and each of the movies based on those books has been a gigantic success. But all of this happened after her work got picked up by a publisher, in particular after it was picked up by Scholastic, which not only brought the might of a large publisher, but also introduced her work to a significantly larger audience in the United States (and, eventually, worldwide).
The fact that she had self-published a couple of hundred copies is happenstance. I doubt it has anything to do with her success.
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