Try running an IHOP or the like. You’ll be keeping a dollar or two on that $15 entree.
Their margins are outrageous but only if they can get you to come inside - they're only making a cent or two off each gallon of gas they sell.
I don't think they are that ineffective in manufacturing, renting/buying land, building infrastructure or paying much more. Some locations ask for higher prices just because they don't have any competition in area.
And yes they charge easily 3x for stuff they know you will buy like redbulls, chocolate and so on.