Why drinkers earn more than nondrinkers (2006)
reason.org
reason.org
All the ad boys going out for drinks at the end of the day (every day) and over time seeing complete morons being promoted into positions and roles they wouldn't qualify for if they'd gone for any decent job interview.
Unfortunately, all this socializing is very un-hackerish and might be the reason many programmers always seem to miss the boat when it comes to a decent salary.
http://www.psychologytoday.com/blog/the-scientific-fundament... (I know, the source leaves a little to be desired)
They are not claiming causation. They are hypothesizing correlation between drinking and sociability/social network size, and causation from that to higher earnings.
The hypothesis seems to be that drinking makes people like you and that gets you better jobs.
As opposed to being social getting you better jobs and making you drink more, or having a better job allowing you to drink and be social, two alternate explanations which seem a lot more likely to me.