Emperor K'ang Hsi tended to give Wai Siu Bo the most difficult and dangerous assignments. A part of it was that WSB, despite his lack of conventional acumen, had a knack for succeeding in helping the emperor to accomplish his goals through unconventional means. Do you think another part of it, however, was K'ang Hsi's desire to give his buddy opportunities to earn more rewards? As emperor, K'ang Hsi had the authority to give Wai Siu Bo any gifts the latter might have wanted, but doing so would have been corrupt and drawn criticism towards the emperor. Perhaps K'ang Hsi saw these difficult assignments as opportunities to reward Wai Siu Bo should Wai succeed in his missions (which he invariably did).