Why let users get away with only paying once? Need to make it a subscription to capture that recurrent value stream. Make sure to communicate the price in coffe

Why let users get away with only paying once? Need to make it a subscription to capture that recurrent value stream. Make sure to communicate the price in coffees, the standard unit of nickel-and-diming. I'd drown in all those "just one" coffees companies would like me to buy