Publishers know fanfic writers with gigantic audiences are guaranteed to sell at least some books. Also anything bearing any resemblance whatsoever to Twilight, hence why every single YA cover has the same font and cover design aesthetic (high-contrast picture of a flower or chess piece or something on a black background). Even people who don't read fanfic know it's based on a Twilight story.
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Check out the edit-addendum I added; it's... wow.
Publishers know fanfic writers with gigantic audiences are guaranteed to sell at least some books. Also anything bearing any resemblance whatsoever to Twilight, hence why every single YA cover has the same font and cover design aesthetic (high-contrast picture of a flower or chess piece or something on a black background). Even people who don't read fanfic know it's based on a Twilight story.