Because it goes completely against the interests of local governments. You will be amazed to see how large a portion of your city and police department's budgets are from fines.
That's true of some fines in some places, but to be clear, it's not really true of parking fines in Chicago. The graph in the article indicates there's about $1 million dollars in tickets issued each year. That's around $ .30 per resident and less than one percent of the billions in revenue the city takes in each year (https://www.cityofchicago.org/content/dam/city/depts/obm/sup..., see page 23 in particular) I did notice that fines in general amount to $300 million a year, so other fines might well be inflated.
I believe the y-axis on that graph (assuming you refer to the last graph) is the number of parking tickets, not the dollar amount of fines. So more like $50 to $100 million in parking fines per year.
You're absolutely right. The graph could have been clearer, but I should have double-checked my assumptions and that $.30 per resident figure should have been a red flag. I apologize for that basic error.
Looking into this more, it sounds like, while there probably is a perverse incentive because more tickets equals a significant increase in revenue, the biggest problem is the punitive fines for minor non-traffic offenses that tend to compound for poorer residents: https://www.motherjones.com/crime-justice/2018/02/how-does-c.... Note the headline is a little misleading, they seem to mean "non-moving violations".
