In reality, pretty much every study of business ever shows that consumers are price sensitive. And you sound like someone who has never ran a cafe.
But by all means, maybe you cracked the code. You should open your store and make a lot of money from these customers who aren't sensitive to price. Don't waste your time theory crafting about it on the internet!
Wait but then if they make a lot of money all of their suppliers will have to dynamically raise their prices! Once the coffee beans and cups arrive you’ll find out how much they cost.
But by all means, maybe you cracked the code. You should open your store and make a lot of money from these customers who aren't sensitive to price. Don't waste your time theory crafting about it on the internet!