It doesnt make a difference if the person who committed the crime has more or less money
Of course it does. A poor person might find themselves in a situation where they have to steal groceries or other necessities for pure survival. If I were poor and needed diapers and there was no governmental support program available I would also steal them. Or formula or whatever. A rich person can afford all of that. If they steal groceries it is for the thrill, not out of necessity.
Also, note that really bad crimes (murder for example) are not fined. In that sense it does not matter what the financial status of the perpetrator is. Although filthy rich people can sometimes even buy their way out of these crimes.