Oh yea, it's totally the socialization aspect. There is a similar study (I don't have a link off-hand, but it was something covered at length in an Introduction to Sociology textbook I had years ago) that points out that people involved in their church communities enjoyed similar benefits to the drinkers. The key here is socialization. I suspect you don't earn anymore by getting ripped by yourself in the privacy of your home every night and subsequently showing up at work with a headache and a sour attitude every morning.