They need to charge what they charge because they have overhead costs. Unlike you buying a six pack and having a beer at home they need to pay rent, labor costs, utilities, insurance, etc.
Determine the pour cost The alcohol cost will be the percentage of markup that a bar will give alcohol. For most bars, this is around 20 – 25%. Some bars might set their pour cost based upon the type of drink. For example, wine at a 22% cost, beer at 20% cost, and liquor at a 14% cost.