Correct, the focus is not on science fiction.

Most users probably come over from https://www.gnod.com after discovering one of the other recommendation projects. The music one is pretty popular. Or they come via googling for "author recommendation engine" or something like that.

Clarke is at position 293:

    ...
    #292 John Flanagan
    #293 Arthur Charles Clarke
    #294 Augusten Burroughs
    ...