I guess it's a little more politically incorrect than offensive.
I think so - a combination of the familiar and the exotic a bit like an older more rural version of a picture of a gypsy caravan or even a plastic donkey from Torremolinos in Britain. The religion thing was probably one tangible way that a non-Jew might define and perhaps objectify a Jew in rural Poland. Something that they knew about well because of the synaogue buildings and the food/Hasidic dress rules but different enough to be a way of defining and objectifying people.
The money thing was doubtless because although rural (and indeed urban) Jewish people could be very poor, given the lack of shared meals or shared religious observance a common way for an ordinary gentile Pole to encounter and engage with a Jew was through their work rather than purely socially.
As for Menorahs, they're both decorative and in the days before electricity very practical and of course also easily available in Poland due to the size of the pre-war Jewish community. I've seen lots there both new and old.