It’s also less than a single sandwich. Not sure how “it depends on the sandwich” adds to the conversation. The point still remains.

The point they were making is: look, it's so cheap it's the cost of one sandwich.

Does that point still stand if it's not the cost of one sandwich, unless you're paying a fortune for a sandwich?

If a diff shop has a sandwich that is 90% as good and is free but has ads plastered all over the walls, I will probably take the free sandwich.

The cost of a sandwich ranges beyond $0.50 to $200.00. It depends on the sandwich adds about as much to the conversation as "it costs less than a sandwich".

And to be clear by "beyond" I mean some sandwiches cost less than $0.50, and some sandwiches cost more than $200.00