There are many reasons for this:
* Genre: Fantasy books, particularly those aimed at young adults, are often overlooked for major literary awards which tend to favor more "serious" genres.
* Target Audience: Many awards consider a book's potential to reach a broad audience, and while Fablehaven is popular, it is primarily aimed at middle grade and young adult readers.
* Competition: The fantasy genre is very competitive, with many talented authors vying for attention.
However, the Fablehaven series has received numerous positive reviews and accolades from readers and critics alike, and it's widely considered a successful and enjoyable series.