Oh, really. So that 1.5% is coming out of the bank's profit?
The banks are in a line of business where they will pay out more in expenses to operate a service than they make from operating the service?
Of course the retailer is going to pay it. The bank isn't going to give up any money to Apple just because their customer (the retailer) chooses to play nice with Apple.
It's just 0.15%, not 1.5%. The banks see value in greatly reduced chance of fraud. I know my Bank, tiny little Wells Fargo, is falling all over themselves to tell me they will be supporting Apple Pay as soon as it's available. The even run ads on their ATMs.