I’ve posted infographics here about hot dogs previously: here and here, for example. The one from Statista below is probably the most up-to-date that I’ve managed to come across, depicting the teams with the highest-priced ballpark dogs as of 2019, juxtaposed with some of the cheapest hot dog prices.
The thought of dropping $7 on a hot dog is pretty mind-blowing to me. At that point, is seems like it’d be worth the extra hassle to just cook a couple dogs at home and find a way to smuggle them in.