you can continue speculating how much they make per cup all you want . as you can see from pictures, they sell more then just a cup of coffee.
Are you familiar with South Korea ? How much does coffee usually cost ? How much does it usually cost to operate a business? What are taxes like? Do they charge for things that we don't in the U.S.?
If you're going to worry about how much they make per cup, per minute, per day per whatever.. Then you better look up what it's actually like running a business over there.
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