When I first began to play poker over 10 years ago it was a fun game to play amongst friends: home games with a ~£5 buy in were a great way to enjoy a weekend evening, as we were newbie teenagers that were too green to know any sort of deep and sophisticated strategy; so we could enjoy drinks, get high, and not take it too seriously. Some of our group decided to study/play the game further, and accordingly moved up from penny stake home games to a more competitive level. One of the things we learned quickly was that to be a successful player one has to detach themself emotionally from the game; there's no point stressing over bad beats, because variance is out of our (player's) control.
Serious poker players have spent years desensitising themselves from the monetary swings, and some undoubtedly pride themselves on their tilt control/lack of emotions.
There's a price to pay for grinding long hours at the tables, and consciously practicing the mental act of containing one's emotions/being cold: one might argue that these mental attributes, which are beneficial as a poker player, cross-over to the player's non-poker social life; inhibiting their 'real life' experience, because they have become a victim of the sociopathic breeding ground that is known as full-time poker.