> If one person gets their life savings cleared out for a $100 speeding fine, how do you equate that financial pain to Bill Gates? Why should Bill Gates be punished more in the same situation for having put the work in to build a successful company?
He's not punished "more", he's punished equitably. The ultimate goal is not to collect $100, it's for the offender to not reoffend.
Disposable income is an actual objective and important concept, and if you ignore it when handing out financial punishment it just stops being punishment at all for people sufficiently wealthy to not give a single flying fuck.
Having "put the work in to build a successful company" — or just inherited their wealth — should not make one immune to punishment, yet that's exactly what happens with unscaled fixed-amount fines.
> You end up with silly (IMHO) situations like someone getting a $290k fine in Switzerland for 85mph in a 50 zone.
There's nothing silly about it. If that's a $500 fine for somebody with an income of 7 figures, it's not a punishment at all and completely fail at its purpose of making the offender not reoffend: they could get such a fine every single day and live just fine while an offender on US minimum wage loses two weeks worth of work on a single fine.