Isn't it that way all over Texas ?
When we lived in Dallas, you could not go into a club or bar(?) and buy a mixed drink.
It was BYOB in a paper sack from the liquor store.
You gave your bottle to the bar tender and your drink was mixed.
You charged the same amount as if the club had provided the booze
Then you got you bottle back where you were ready to leave.
It was a crazy system, and maybe (hopefully) things have changed since the '60's