How do cities make the most money from it's citizens? Parking tickets is my guess.

That street sweeping scam... they got busted for that already, when they didn't have any working street sweeping machines, but were still issuing tickets https://justacarguy.blogspot.com/2015/03/street-sweeping-tickets-given-despite.html

Parking meters came in 4th, and wheel cramping - lets face it, that's outdated by cars that don't "slip" out of gear. When's the last time you heard of a car in the city on a hill just popping out of park and sliding down a road?

I never have. I'm certain that's been kept on the books only to issue tickets and pull money out of citizens.