1. You can always depend on them to give you good book recommendations
  2. You don't have to think very hard about what to gift them 
  3. You can call them in the middle of the night to discuss a book and they'll more than match your enthusiasm.
  4. Their facial expressions while reading will never fail to amuse you.
  5. Tons of inside jokes are possible if you just give in and join them in their fandom.
  6. Your life will never be empty of drama. Especially when their favorite character has just died.