I'm genuinely curious, what is the appropriate percentage of a person's wealth to take when they overstay at a parking meter for a few minutes?

If it happens occasionally, the same as anyone else. If it's a habit, increasing amounts until they rid themselves of it.

I think a fair answer would be divide the current ticket cost by the amount of cash the average total asset value at the poverty line. Forget about net wealth, since that might well be negative.

The appropriate amount is one that makes the poor and rich alike avoid the behavior.

If you set a crime with a flat fine you have only decided that it’s a cost for the rich and a barrier for the poor.

You can have the opinion that this an ok and appropriate situation and I will retain my opinion of anyone who agrees with that situation

In my city, for a poor person, it’s about 1% of their weekly gross wage.

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Depends on how egregious it is and how frequently it happens.

In terms of egregious: Someone staying a few minutes over when they are in a store probably shouldn't be punished at all. On the other hand, someone parking in a handycap spot or leaving their car somewhere for a day or more should probably be a reasonably stiff penalty.

In terms of frequency: Perhaps start small but with an exponential increase for each time someone does it within a calendar year.