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That pretty much sums it up since only you control how much you make.
It's not like asking how much can a librarian can make, because those are fixed salaries paid to you week in, week out. Not many factors will drastically change how much a librarian can make.
You are basically talking about a sales job with no defined limits on how little or how much you can make. I would say the Johnny Cupcakes type results are not typical, but they are possible.