That's the thing about bears and mages - bears have such high dodge and armor that a high h/s value actually helps them out. Mages have a high mana pool as well as mana shield, so that a high m/s value helps them out.

Birds on the other hand cannot utilize h/s and m/s as well as bears and mages can. If we have a high h/s, then we will still die fast from poor dodge and armor. There's no real reason for us to sacrifice damage for a high m/s. Thus birds are the most expensive class to play regardless of whether or not those skills are maxed