I'm Poor Charlie's Almanac, Charlie Munger explains that cheating is a huge problem, and that if you create a game where people can cheat to get ahead, they almost inevitably will.

At Google you could cheat the promotion system. Just spend more time optimizing for promo than for improving products for your customers, and you would be handsomely rewarded. You end up with the cheaters becoming the leaders and the good engineers leaving in frustration when they need to take orders from cheaters.