I work with a single employee, and used to make my evening calls buzzed after i got in from the field and after he left. Some nights it was more than buzzed, this gave me extra energy to 'keep going' but at a high price.
I would over comit, under estimate and cause myself big issues, sometimes wondering if anyone noticed my drinking (at home making calls).
Now that I dont drink I am returning less calls but I can keep promses better and think about the jobs with a clearer head and project future sales. I am much better at this without drinking.
I think some employers allow the drinking 'after hours' to enhance mood to promote sales but it does come at a price. I'd personaly never encourage someone to have drinks at work. I've had so many druken 'plans' it aint even funny, that never materialized.
I could see it turning into a real problem...