[ryanburk]

I believe it is skewed since many people in these neighborhoods aren't making their money through salary income (anymore), but instead through interest / dividends.

If you sold your company, aren't working at FB/goog/etc and are sitting on a ton of stock holdings, your income is going to show as near $0

[vasilipupkin]

that should be accounted for in govt household income calculations, but I could be wrong. For example, ton of stock holdings will pay you dividends or capital gains.