Not the wealth plays major role here, but relatively small difference between richest and poorest people, that makes crime rates quite low in Norway.

Having people in prison for a shorter period is still cheaper than having them come back again and again. For smaller crimes people are allowed to go home for the evenings/weekends and the biggest punishment really is loosing the ability to work.

I guess that this can prevent people from completely loosing touch with outside world which makes it easier to go back to a normal life.

Example article on crimes vs equality.

https://www.economist.com/graphic-detail/2018/06/07/the-star...