They just give a price for a glass of wine - or for the whole bottle, if you want it. Hey, what's the cost of a 6 oz glass of wine? Decent box wine might be $0.75. Sure, there's the cost of the facility, service, cleaning glassware, etc, so mark it up a bit. A factor of 10 seems steep but usual. But when they cut it back to 4 oz, I'll just say 'No thanks, just water'. Or perhaps a beer..