The most important thing is, the Hundred Solutions Spirit Pill costs very little, while the Clearing Void Pill that can cure all diseases in one go has, due to the inclusion of millennium-aged Yellow Jing and ginseng, a price at least a hundred times greater than the Hundred Solutions Spirit Pill! If every one of the more than six hundred thousand currently sick patients were to be treated with the Clearing Void Pill, the spent Spirit Stones would amount to an astronomical figure, and no Immortal Sect or Demon Sect is willing to pay such a great cost.
It's the same old saying, mortal lives are worthless in the eyes of the Immortal. Immortals save lives for Merit, and if it costs them too much effort, then the Merit isn't worth it. And don't forget, it is only the Clearing Void Pill refined by Ning Xiaoxian with the help of the Fu Yu Tripod that can be so effective; it is unknown whether other Pill Masters have this ability.
