You can't lose money making and selling coffee. Coffe literally costs $0.05-$0.2 to make.

1$ is probably at cost. And everything else have extremely good margins. Probably outside the cheapest items on menu. And those are there to build brand loyalty.

No way. My home coffee is 14 oz. for $5 and lasts like 25 cups. That's $0.20 a cup. At McDonald's scale, their filter cost is 0 and I'm sure their coffee bean price is half of that, at $0.10 a cup. They're also really automated. If you've ever seen how automatic their soft drinks get poured in the drive-thru, it's like a factory.