The thinking that life's like a game of poker is not new, but it's easy to forget and end up revealing all our cards to people we don't want to.
Sure, some people would doubtlessly accuse a poker face of being scheming, untrustworthy and hypocritical. However, a poker face isn't all about hiding everything from everyone. It's about hiding what you need to hide, from people whom you need to hide. There's only so much you want people to know about you. Any more than that, you start to tell people too much, which, well, would definitely attract unwanted attention.
Keeping a poker face also places you in the dark, Splinter Cell-style away from the spotlight. Well, apart from granting you the ability to strike from the dark (which totally isn't the primary goal, nor what we're encouraging here), keeps you away from danger. You avoid having a huge "I am here, come and get me" label hung over your head.
