Because it is fake competition, which is pretty much what we get anymore. With real competition, one of the two places might do a better job of pleasing customers and get most of the business. With real competition, the employees preparing and serving the food will get a free market wage. Otherwise, it is all Disneypeople serving Disneyfood.
it's not been free market competition for a long time. I look out at the number of Pret a Mangers that office workers around me go to at lunch. It's like watching pigs going to the troughs to feed. The buildings empty, the pigs go to the next available spot and they return to their pens. They don't really give a shit really how long the lines are. Also fast food employees getting free market wages? They get minimum wage and if they work there for two years, they get a dollar increase to their wage. That's it, there is no lateral promotion.