The chances, I always aim for the chances. That is maybe the main reason why I still stick to opening booster packs such as set boosters from old release sets as I am on the main objective on that: the chance to open the good cards, Wandering Emperor, Meathook Massacre, etc. Going with the calculations, the chances of Mythics in a booster box is already low enough, much more on the specific card such as those mentioned.