"Incurred violations" should be effectively $0. How often are you getting a traffic ticket? I think the last time I got a ticket was a decade ago...
Spread across a city probably more than you think, especially if you include parking tickets. I've never had a driving ticket, and maybe 4 parking ones over decades, but I'm probably on the lower end of the curve. In their first 40 days of operation, Oakland's speed cameras issued 82,000 tickets according to reports. I welcome those as they make streets safer, and I think they should be low cost, but high frequency.
Yeah, that seems like an odd factor to include. The whole message of fines is supposed to be "don't do these specific anti-social things" not "be sure to factor in the arbitrary charges you'll be hit with".
If you live in a city, parking tickets are fairly inevitable. I am sure some folks get away with none but at least in SF I have gotten tickets that were not even for the correct meter and it’s takes more time (at least used to) to fight it than pay the money.