I have no prior experience in the food industry. But I think that I speak for all of us. We are all on the lookout for something that will sell at our concession stand in enough numbers to justify its existence, but will not cost more than we can sell it for, won't take too long to prepare and doesn't bring the health inspectors down on our heads unduly.
We don't sell hot dogs because of the waste and the health department in our area. We know from our competitors experience that they don't sell well enough to justify all the wasted hot dogs. They had a freezer full of used? hot dogs to be inspected by the health department before disposal and hadn't passed a health inspection in memory because of them. This makes cooked foods a problem unless the sales are great. We don't think that our customer base expects to find cooked food at any theater and so they probably wouldn't buy enough to justify the extra effort.
Tha doesn't mean that we only sell popcorn and pop though. We sell nachos, cookies, snack mixes, herbal teas, hot chocolate, hot cider, cappuccino, coffee, punches, juice boxes, water, etc. Thinking about cotton candy.
Keep an open mind but be careful about adding new menu items.