Barrels of ale will be brought out behind a wall of unbuilt wicker baskets or something, with one wicker basket in the middle. I'll be taking orders, and i'll put the orders in the wicker basket.
This way, you will have to queue up for beer, and if we have 2 or 3 people working, it will be fine.
Customer walks up to the wicker basket, places an order for a mug of cold beer, puts the 1c in the basket and waits. Meanwhile, I (the bartender), take the money, pocket it and hand out the mug of beer.
We will have to have donated mugs and wine cups and wine bottles, or the customers can bring their own drinking utensils (which would kind of ruin it, seeing as most people don't have mugs...). So that is a problem. If I handed out mugs, most like i'd never see them again.
That is what I thought i'd do...
So, a look at the inside of the cabin:
WWWWWW
WxxxxSxxW
WbBbbBbbW
WxxxxxxxW
WWDWWW W = Wall S = Storage for beer or whatever b = Unfinished wicker basket that'll act as a fence B = Finished wicker basket D = Door
I think that'd stop people just walking behind the bar and taking away ale for free. If someone who wanted to be a griefer came along and started destroying the unfinished wicker baskets, i'd just replace them with more sticks and get the griefer kicked out or killed.
I'd have Brodgar on my side along with many other customers

PS: Also, like I said, if someone was feeling generous, they could buy a whole barrel of beer and choose what to do with it. Either bring it out for free drinks for all, or just drink it all for themselves :p