Georgetwon SC, why so cheap? (Summerville, Georgetown: to live, wealthy, relocate to)

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Hello! Native New Yorker here, looking to relocate to SC in 1-2 years. Beginning my search on Zillow. Please compare John Island to Georgetown to Summerville. What are these towns "like."

Please list 2 low class towns, 2 middle class towns, 2 upper middle class town, 2 upper class town, 2 you gotta be rich to live here in this town towns.

Low Class
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2
Middle Class
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2.
Upper Middle Class
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2.
Upper Class
1.
2.
Rich Wealthy Affluent to the max
1.
2.