I was alive in that time and girls did not like those books, at all (of course WOMEN may be a different story). They liked Harry Potter, and LOTR after the movies came out because Orlando Bloom.
Characterizing girls as only liking Harry Potter and Orlando Bloom is like saying boys only liked WWF and Jackass. It's a mindless stereotype.
If you have seen only boys liking Harry Potter, LOTR or Ender Game, then it is purely result of who you picked as friends. Because girls read all of those.