So, the point of it being income based is that the cost of the fine will have an impact on everybody getting the fine, not just poor people. The price being too high for rich people while simultaneously too low for poor people doesn’t really fit.
Maybe he was poorly quoted, but he didn’t mention quotas which isn’t really a problem with this type of fine, it’s a problem with police. If it was public knowledge that I didn’t do my job all month and had to scramble to finish it at the end I wouldn’t be very highly regarded. Having said that even if the problem stays and we change the fines they could simply make the quota about the number of fines as opposed to the amount of money coming in.