I always thought of South Jersey as being filled with Yoo-yun members who took the Walt Whitman Bridge to Gloucestor and Camden Counties. There are some wealthy folks in places like Haddonfield, but most of the wealth in the state is concentrated north of I-195, especially in Hunterdon/Somerset/Morris Counties (all of which vote GOP, BTW).
Mafia
I've always thought of North Jersey that way. At least, that was always my impression. But, it makes sense that most of the wealth would be concentrated in the north because most of the population is concentrated in the north. Our own township is very blue-collar, but there are plenty of upper-middle class townships like Cherry Hill and Medford, and some wealthy areas around here, too.