[ricardobeat]

You're completely ignoring the food cost I just mentioned. For example, the cost of a Big Mac is around 1 dollar. Try making a burger with ingredients from the supermarket for $1, it is impossible. Things easily cost 5-10x as much in retail vs their bulk prices, it is much cheaper to cook for 50 customers at once than for a single meal.

This system is removing all of the other costs of operating a restaurant, so unless you also buy ingredients in 50kg bags for your home, they can definitely make it cheaper.