I've installed Cyanogenmod on every Android device before and Cydia on my first iOS device (my first smartphone was an iPhone 3GS).
The clerk you are talking about, will still not know what NFC is for payments in a year from now. It doesn't change anything that Apple now joined the same game with Apple Pay... It's more infrastructure related and demand related.
Just like the Apple Watch, there is no actual demand for NFC Payments from regular users.
There was demand for the iPod, iPhone and iPad. Also Maps applications are used a lot (Navigation).
We don't use watches anymore (check your smartphone), we still pay with our wallet and with cash.