Probably some combination of never hearing of such a thing (I just looked it up) and that the whole idea of directly paying for parking / time-limited parking i

Probably some combination of never hearing of such a thing (I just looked it up) and that the whole idea of directly paying for parking / time-limited parking is still offensive to many of us ("just build more parking lots") and doesn't exist in many places. Then after hearing about it an obvious objection is that it puts an extra burden on the driver to manage the thing even when they just want to pop-in/pop-out, and that if the level of abuse is actually a problem we might as well go all the way with a full blown pay-always approach.