I have NEVER seen anyone walk out of a store because they don't accept a specific method of payment.
They ALWAYS use the method accepted and pay.
Only exception is cash. There's a few small businesses were I live that only ACCEPT cash.
They do have cash machine available if needed.
I think the Apple zealots will be the first in history to walk away when they have a means to pay in their pocket believing they are making an impact on sales.

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Where did I say they, people will walk out of stores because they don't have a certain payment method?
Some simply won't go, I would never go to a store to purchase something, with the mind set that I'll walk out leaving my item(s) behind if they won't take Apple Pay.
What I will do is, go to Walgreens rather then CVS/Rite-Aid and over the next year they'll lose money from people like me, who go there a lot. I'm sure we'll see stores like Wahlgreens advertising exempting Apple Pay soon. I know I would, even if it's a short term surge until CVS/Rite-Aid see the light.
Do you think that Apple doesn't have enough of a following to effect sales???
Do you think Apple Pay is not a more secure and private way to pay???
Ask Blackberry about Apple's following and their Zealots having an inmpact on sales!
If you have any business sense at all, you would know, even a small amount of people can have a big effect on store chains. Let's use 5 people for example, X how many Target stores, with an average splending habit of $10 per visit? How much could that add up too, then add up how many times those 5 people per year visit? Keeping in mind how many Target Stores their are, how many Walmart stores etc.
Factor in a big purchase from one of those visits.
That adds up quick, we have 2 shops, and if 5 of my customers decided not to use us, and go to the competition, would I not lose a good amount of money? Simply because I wouldn't exept a payment method that costs me nothing.
Losing any amount of money, simply because you turned off a prefered payment method, by evan a small portion of your customer base, is just plain ignorant!
Being an Apple Fan does not cloud my common sense or business sense, hating Apple or Apple Pay should not cloud yours!