I'm sure there are examples of abuse.

But I honestly don't see the problem in principle.

If a court issues you a fine and you simply ignore it, that's not a situation society can just ignore. If you are truly unable to pay, that's more complicated, but should not just simply magically resolve you of responsibility.

There has to be other measures to ensure that money is paid or an equivalent cost is beared. Garnishing wages being an obvious first step.

(This is especially true if fines were to scale with income/wealth)