Sure. Do it as an increasing-upon-recurrence, two part fee though.
1st offence = base fee
2nd offence = base fee + minimal % of wealth fee
3rd offence = base fee + higher % of wealth fee
offences thereafter = goto 3rd offence until some breaking point condition like gaol/jail.
Otherwise the rich will happily pay to do whatever the hell they want.
How about you prove your claim by providing some evidence that the richer you are the more speeding tickets you get. Otherwise you're solving for a problem that doesn’t exist.