Students pay 30$ extra for usage of the “barnacle” in addition to the fine.
Sounds like they make it up in volume. I doubt they'd get a tow truck out there 40000 times.
With a small chisel + some practice someone could likely clear a cark park - or several streets - full of these within a few hours (overnight), and render the devices unusable until repaired.
Doesn't seem like a well thought out invention. :/