[tux1968]

> This is another way that income-based fines work well - the people with the means to influence this change now have an incentive to do so.

You're only thinking of one half of the problem. The rich people who are targeted more vigorously will be able to fight back. But the poor people who are left living in communities where the laws aren't being applied will have to live with the results of lack of enforcement. It sucks living in a place where the police will not punish offenders because it's not worth the effort.