I believe DUmmy greenbriar could produce a best seller if she plagiarizes a really good writer. The last time she was caught plagiarizing, it was from some other pinhead at the DUmp, and of course no one would pay for that.
Also, she cannot just plagiarize an idea or outline. She must copy word-for-word. Otherwise, her spelling, grammar, and punctuation would overwhelm any editor, and worse, her own ideas and personality might show through. That would be a deal killer.
She is pretty much limited to taking someone else's book and changing the title and byline.