No.
Every person should be treated equally under the law, if a crime is punishable by a fine then the fine should be determined by the severity and nature of the crime, not by the nature and status of the individual committing it.
I'm not sure how you can say 'No' to "when the punishment is a financial one then the punishment is essentially different depending on the financial status of the person receiving it" - you might not agree with implementing fines in that way but the actual punishment aspect does vary with a fixed monetary amount depending on the financial position of the person it is leveled against.
and they can be treated equally and proportionally... a % fine can be equally applied and may well have a more equal punishment/deterrent effect
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