Folks, really now.
If you're in a line for a ticket machine, and there are people behind you, you should take the opportunity you have while waiting to go digging through the Bag of Holding you call a purse to pull out your credit card and have it handy for when you get to the front of the line.
I mean, it can't be a surprise that you're going to use it. Yes, I can see that if you're unfamiliar with the machine, you won't know exactly when or how it will demand your card or cash, but what else is it going to do? Ask for a retinal scan or a DNA sample?