Yeah...my college roommate is from Marietta and there were several girls in my chapter from that area (I swear half my pledge class went to Westminster) and they were all really wealthy. I visited the area and it seemed very very well-off to me.

My sister-in-law is from there, very old, very southern $$ (and power) in her family.

Marietta is its own town now, but it began as a suburb of Atlanta and grew into a different city as a product of sprawl. Marietta has its share of wealthy people, and like many ATL suburbs (Alpharetta, Peachtree City, etc), are generally considered well-off areas.