Most bar owners are meticulous when it comes to the cash side of their business, but as for regulating booze, their skills can sometimes be impaired. Even establishments with Class A liquor licenses lose 30% of their alcohol on average. We think of your liquor as money, and liquor lost is money down the drain. It is not uncommon for a bar to lose $1000 per week. When the math is done, that’s $52,000 per year.