Making a ticket proportional to wealth is just discrimination. I hate it when people just want to penalize the rich for "being" rich. It's stupid and disingenuous to the debate over traffic safety.
It's not. The GP explained it quite clearly: the value of a fine is meant to dissuade you from performing the action leading up to that fine. If the fine is irrelevant when compared to your income, it doesn't serve its purpose. Flat rate fines *are* discriminatory, since they only affect poor people. Making them proportional to your income fixes that problem. Also, someone "rich" who gets fined isn't being penalised for being rich; he's being penalised for not obeying the law.
Case in point: some guy was fined around $1M a couple of years ago for speeding in Switzerland. His income is, presumably, many times that number. If he were fined $200, do you really think that would be a deterrent against future infractions?
Now, you argue that fines are not the way to go. That's a different discussion. Where I live, you get a fine and lose your licence for up to 3 years - there's a penalty that affects all income brackets equally (*). I like your community service idea even better. But your analysis of the fairness of income-proportional fines is flawed, and typical of the "oh poor rich people, persecuted by the evil society" mindset, so unbelievably popular these days (with GOP candidates, I mean).
(*) Well, at least on the surface. In fact, those of us with drivers will be less affected, as will those that can pay to take a cab anywhere they go.