Yea, we sometimes have friday night beers. Havent lately, I think its because we are too stuffed by 5:30pm friday of late. We usually finnish up work - do timesheets etc for 15 minutes or so, then have a chat for 1/2 hour, about work schedules and lesiure. It's really good team building. The boss keeps the fridge stocked with a few beers, we dont pay for it. I consider it a way for the boss to allot a time where we arent expected to work, and can just get to know each other - this develops closer bonds which make us more likely to offer to help someone when we hear that one member of the team are going to pull an allnighter to get a project finnished.
Last year, we all stayed back on a tuesday night to finnish a project. We finnished it at 2:30am! If it wasnt for the team spirit that we have, this wouldnt have happened. The client was so impressed to get the finnished project by email at 2:30am and hear that we had all stayed back, that he had a local bottle shop deliver a slab of carlton draft for each of us - that was very cool!
In terms of legality - it is pretty harsh for the boss not to pay for the brews. We typically have 1 or mabee 2 stubbies. For the team building that the team gets, it is well worth it. Obviously, selling alcohol would be just like me selling my home brew, which would incur severe legal repicussions. I have taken my hame brew to work, but to share for free, not sell.
In terms of HSE or OH&S, there may be some workcover claim possible if someone had a car crash on the way home. But, I have worked at places where it was common for the afterwork drinks to occur at the pub. From rumours, it sounded like some of those afterwork drinks turned into all-nighter partys. So whats better - having a limited supply at work, afterwich, people go home, or going to a pub with unlimited alcohol! The workcover claims are not recognised when you dont go directly home from work.
I like the afterwork drinks, and, as adults, one can expect people to be responsible.