Look up the concept of "day fines", which are used in Finland elsewhere:
https://en.wikipedia.org/wiki/Day-fine
Surprisingly they were experimented with in the UK, for a very brief period of time. But not taken into use.
Every now and again a particularly large fine, often for speeding, will make the news. For example this story does the rounds now and again "Finland, Home of the $103,000 Speeding Ticket":
https://www.theatlantic.com/business/archive/2015/03/finland...
That doesn't answer the question, do they work better than flat fines and points on licenses (that lead to suspensions)?