How does buying an #urbanfantasy novel equate to donating to #autism?

How does buying an #urbanfantasy novel equate to donating to #autism? Though I am not a writer in this genre, it seems to be all the rage. And this website by Becca Hamilton is the most thorough and professional that I've come across. Have a look and see if you agree. ljt

Please note that the author has autism as her pick for donations. See her site for more details on how to do this. #Wonderful ways to help others.