The Cards have had a history of finding ways to get guys to stay despite they're being more money elsewhere. Whether it's the city, baseball fans, chance of winning or the coaching staff, somehow; the mid-market Cardinals seem to be an appealing place to play ball.The Cardinals have signed Mark McGwire as their hitting coach (source MLBTR) , the signing is significant because McGwire is Matt Holliday's personal hitting coach.McGwire was just as enthused as he discussed the collabo...