I think part of this ridiculous fast food prices are the result of the people who never really looked at prices because "it's cheap" going in and ordering random shit and getting surprised.
Prices of combo meals is all over the fucking place. Some shit has barely moved in a couple years but they'll introduce a basically the same thing for $5 more. If you're just picking what looks good without looking at the price you're gonna get the fucking you deserve.
The people who historically stuck to the value menu or looked at prices and picked a high value per dollar combo meal, eschewed the overpriced shit, etc, etc, are probably still eating for under $15 per person per meal because they're avoiding all that shit.