Grimms' Fairy Tales are all about the haves and the have-nots. Pretty much every character is immediately identifiable by social class (unless, you know, they're in disguise). To quote the Boss, poor man wanna be rich, rich man wanna be king—and magic is a great way to help with that. Of course, some social mobility inevitably occurs since those pesky poor people keep rescuing and disenchanting nobles and end up marrying them. But those are only the lucky ones; the rest of the downtrodden stay exactly where they should be: under some rich dude's heel.
Money never brings about anything good in these tales.
Poverty never directly kills anyone in fairy tales, so it's okay to be poor in them.