I didn't read the articles, but here's my attempt at some quick math:
Half of 14000bbl is 7000bbl.
14000/365 = 38 kegs worth of beer a day
That is a LOT of beer being sold at a pub.
My guess is that less than half the beer being made is sold at the pub, but more than half of total sales is made there (food, merchandise, etc.)
They are always packed, but I don't know the amount of beer they sell. They also move some food, hats, and Shirts