Earlier quoted context omitted.
It means they don't have $50m. I'd say that shouldn't matter, we don't give the poor a discount on parking tickets either (actually, we usually make them more expensive).
I have seen a proposal to make the cost of tickets based on value of the car. The thinking is that a person with an Audi is not at all disturbed by paying a $20 parking fine, so it isn't an incentive. It's an interesting idea, but I'm not sure how hard it would be to implement.
As for the proposal, I'd be for it. I make enough that under some circumstances I very well might just pay the $35 than drive around looking for a parking space. When I am in a car, though, it's usually in our ten year old Scion that cost $20K brand new, so I don't know that would it would be such a disincentive for me (and my illegal parking is a rare occurrence regardless, and usually by accident), but might work for the general case.