I think you raise a good point. In a city (like Chicago) they probably don't seem too high. I live 3ish hours from the nearest major city (Indianapolis) and they seem high. I do think it is confusing, however, to separate out the sides - every other Disney quick service in the parks includes them so people will expect them. It's been done purely to increase guest spending without considering how it'll probably put off a lot of guests who'll instead decide to go to one of the quick services which are cheaper once sides are included.