I don't vote.
I've never seen anyone in that tavern, ever, so I'd say yes. But the argument for played bartenders is very good.
I do vote to support Lolitra's idea, though.
The owner doesn't have to be in the tavern.
And, maybe, there could be a system of empty mugs to give back to the bartender (or leave on the tables). Maybe a full mug becomes an empty mug, which is a quest item that cannot be sold, only given back to complete the bartender quest.