they’re overpriced in the sense that a sandwich does not in any universe cost that much to actually produce, not in the sense that they charge more than other people do for sandwiches.
7 euros isn’t too much more than what a sandwich can tend to cost at Pressbyrån in sweden, which is infamous for charging out the ass for everything just because they can. A normal grocery store that carries some premade sandwiches might charge more like 5 euro for them.