You don't order food from a restaurant and have the restaurant take/withhold a portion of your meal off you to cover the cost for bringing it from the kitchen to your table.
But they do charge you more than what it costs to make the food. I know what a USDA Choice ribeye costs and it sure isn't what the steakhouse down the street charges me. You could also say that your restaurant bill is covering all the food they have to throw away at the end of the night. Not to mention tip, there's another 20% add on.