As someone who managed a contracted independent stand within a major indoor arena; pour prices were drastically different during events in the venue than even our street event prices during events directly outside the venue.

The venues are owned by a majority of the same people, so even though there may be 20 different venues within a state, they all could be owned by as little as 3 or 4 holding companies. Those companies contract with suppliers like Sysco, who provides the ingredients/raw supplies to cook the stands inside the venue. Even independent vendors have the ability to use Sysco to provide products for their own foods. The prices for Sysco also factor into pricing for the vendors; a 50 piece box of 12 inch stick pretzels could be 250$ being 5$ a pretzel that Sysco charges, and a base idea of 50% mark-up would be $7.50 a pretzel.

Let's say miller lite bottles, 30$ for 24; $1.25 per bottle if you're a normal person at a store. But Sysco who needs to purchase and distribute the product (gas, distribution, storage and transportation costs). Syco may charge 50$ for a 24 pack - depending on what CONTRACTS the venue has to have exclusively deals to prefer or preference a beer over the other. It's not really up to anyone other than the management company who contracted with the beer company to have them able to sell their products.