The biggest reason I think being the difference in realestate values-they're lower in that area of the southeast. It's all relative, realestate values. Many move to coastal Maine to retire because our realestate values are generally lower than coastal realestate in in lower New England.
One couple I know bought waterfront in South Carolina for little $(relative to their home here). It's on the ICW. There's another relative term, "waterfront"...