Through fortune (by having a bad staff quit) or misfortune (one of your best assets has left your team), you find your self playing the hiring game again. And like any game, violating the laws will get you in trouble. These are the deadliest (and costliest) mistakes you can make in the hiring game. I am sure that none of these apply to you, but you probably know a friend or two who could use that information! 1. Going cheap Bob just had his receptionist, Sue, retire on him.