My wild guess tells me that “idk” means I would like
Cost per hot dog to the company selling them would be in the ballpark of $1 buck, this includes the bun, hot dog, mayonnaise, mustard, packing materials, transportation, storage, etc. The Stadium owner gets a cut, then the manager, then the guys who employ those guys selling hot dogs, then these guys must earn some bucks, so is a big line of middle man here. Now if you could get up of your lazy seat and say buy the hot dog from a vending machine then you could cut down costs, but logistically speaking it wouldn’t work.