Just like an amusement park or a movie theater, con food can be overpriced.
As much as you may want Ferengi Fries, you're paying for the name "Ferengi", buddy, and if you're not in a high-class establishment this event may be catered by the same folk who run that sad-looking cart at the county fair. If you can swing it, head out into the city and grab something at a local restaurant or deli instead. Or pack a sandwich in your stormtrooper belt.