Would the average user raise a chargeback for €/$ 5 of parking fees? Even if the scam results in them getting a parking ticket, the cost of the parking ticket isn't subject to a chargeback, only the scammed parking fee itself.
I don't know and who cares what the average user would do. Thats the defense. It depends on the user experience, chargebacks aren't hard and can be done attempted with just the click of a button for some user's banks.