In general, all player content from an adventure path is added to HL for free. That includes magic items, prestige classes, gear, familiars and so on. For Rise of the Runelord's re-release we also added the monsters from the bestiary, since it was kind of its own special book. In general though, we don't make the monsters from the APs.
Aaron,
May I ask why you do not add the monsters from the AP's at all? I really want to have that done and yes I know about the player based ones and do use them but it would just be so much nicer if Lone Wolf did this and it was official.
If anything why not do the monsters as a premium add-on that customers can purchase.. and do each Adventure Path as a set and charge some sort of price like $4.99 or some such for the entire Adventure Path?